Online Etymology Dictionary

snit (n.): "state of agitation, fit of temper," 1939, American English, of unknown origin.
snitch (n.): "informer," 1785, probably from underworld slang meaning "the nose" (1700), which apparently developed from an earlier meaning "fillip on the nose" (1670s).
snitch (v.): 1803, "to inform," from snitch (n.). Meaning "to steal, pilfer" is attested from 1904, perhaps a variant of snatch (v.). Related: Snitched; snitching.
snite (v.): "to blow the nose," c.1100, now Scottish and dialectal, from Old English snytan, related to Old Norse snyta, Middle Dutch snuten, Old High German snuzen, German schneuzen "to blow one's nose," and to snot.
snivel (v.): Old English *snyflan "to run at the nose" (cf. snyflung "running of the nose"), related to snofl "nasal mucus." Meaning "to be in an (affected) tearful state" is from 1680s. Related: Snivelled; snivelling. Snivelling "mean-spirited, weak" is recorded from 1640s; Melville coined snivelization (1849).
snob (n.): 1781, "a shoemaker, a shoemaker's apprentice," of unknown origin. It came to be used in Cambridge University slang c.1796 for "townsman, local merchant," and by 1831 it was being used for "person of the ordinary or lower classes." Meaning "person who vulgarly apes his social superiors" arose 1843, popularized 1848 by William Thackeray's "Book of Snobs." The meaning later broadened to include those who insist on their gentility, in addition to those who merely aspire to it, and by 1911 the word had its main modern sense of "one who despises those considered inferior in rank, attainment, or taste."
snobbery (n.): "the class of snobs," 1833, from snob + -ery. Meaning "snobbishness" is from 1843.
snobbish (adj.): 1840, "pertaining to snobs," from snob + -ish. Meaning "with the character of a snob" is from 1849. Related: Snobbishly; snobbishness.
snobby (adj.): 1846, from snob + -y (2). Related: Snobbiness.
snog (v.): "to flirt, cuddle," 1945, British English slang, of unknown origin. Related: Snogged; snogging.
snogging (n.): "kissing and cuddling," British English slang, 1945, of unknown origin.
snollygoster: 1846, American English slang, fanciful coinage.
snood (n.): Old English snod "ribbon for the hair," from Proto-Germanic *snodo (cf. Swedish snod "string, cord"), from PIE root *(s)ne- "to spin, sew" (cf. Lettish snate "a linen cover," Old Irish snathe "thread;" see needle). Meaning "net or bag worn over a woman's hair" first recorded 1938.
snook (n.): "derisive gesture," 1791, of unknown origin.
snooker (n.): 1889, the game and the word said to have been invented in India by British officers as a diversion from billiards. The name is perhaps a reference (with reference to the rawness of play by a fellow officer) to British slang snooker "newly joined cadet" (1872). Tradition ascribes the coinage to Col. Sir Neville Chamberlain (not the later prime minister of the same name), at the time subaltern in the Devonshire Regiment in Jubbulpore.
snooker (v.): "to cheat," early 1900s, from snooker (n.), probably because in the game novices can easily be tricked. Related: Snookered; snookering.
snookums (n.): trivial term of endearment, 1919, from Snooks, proper name used in Britain for "a hypothetical person" (1860), cf. Joe Blow in U.S. As an actual proper name, Snooks dates back to the Domesday Book and may be from Old English *snoc "a projecting point of land" (perhaps here with sense of "a big nose").
snoop (v.): 1832, "to go around in a prying manner," American English, "to appropriate," probably from Dutch snoepen "to pry," also "eat in secret, eat sweets, sneak," probably related to snappen "to bite, snatch" (see snap). Specific meaning "to pry into other people's business" is attested from 1921. Related: Snooped; snooping.
snoop (n.): "detective," 1891, from snoop (v.).
snoopy (adj.): 1895, from snoop (v.) + -y (2). The cartoon dog of that name in the "Peanuts" newspaper comic strip debuted in 1950.
snoot (n.): "the nose," 1861, originally a Scottish variant of snout.
snootful (n.): "as much (liquor) as one can take," 1885, from snoot (n.) + -ful.
snooty (adj.): "proud, arrogant," 1918, noted that year as college slang, from snoot + -y (2). Probably with suggestions of snouty (1858); the notion being of "looking down one's nose." Related: Snootily; snootiness.
snooze (v.): 1789, cant word, of unknown origin, perhaps echoic of a snore. Related: Snoozed; snoozing.
snore (v.): mid-15c., probably related to snort and both probably of imitative origin (cf. Dutch snorken, Middle High German snarchen, German schnarchen, Swedish snarka). Related: Snored; snoring. The noun is from c.1600.
snorkel (n.): 1944, "airshaft for submarines," from German Schnorchel, from German navy slang Schnorchel "nose, snout," related to schnarchen "to snore" (see snore). So called from its resemblance to a nose and its noise when in use. The anglicized spelling first recorded 1949. The meaning "curved tube used by a swimmer to breathe under water" is first recorded 1951.
snort (v.): late 14c., "to snore," probably related to snore. Meaning "breathe through the nose with a harsh sound" first recorded 1520s. Sense of "express contempt" is from 1818. Meaning "to inhale cocaine" is first attested 1935. Related: Snorted; snorting. As a noun, "a drink of liquor" (especially whiskey), from 1889.
snot (n.): Old English gesnot "nasal mucus," from Proto-Germanic *snuttan (cf. Old Frisian snotta, Middle Low German and Middle Dutch snotte, Middle Low German snute), from the same base as snout. Old English also had a verb snite "wipe or pick one's nose." Meaning "despicable person" is from 1809.
snotty (adj.): 1560s, "full of snot," from snot + -y (2). Meaning "impudent, curt, conceited" is from 1870. Snotnose "upstart" is from 1941.
snout (n.): early 13c., "trunk or projecting nose of an animal," from Middle Low German and Middle Dutch snute "snout," from Proto-Germanic *snut- (cf. German Schnauze, Norwegian snut, Danish snude "snout"), related to Old English gesnot (see snot).
snow (n.): Old English snaw "snow," from Proto-Germanic *snaiwaz (cf. Old Saxon and Old High German sneo, Old Frisian and Middle Low German sne, Middle Dutch snee, Dutch sneeuw, German Schnee, Old Norse snjor, Gothic snaiws "snow"), from PIE root *sniegwh- "snow, to snow" (cf. Greek nipha, Latin nix (genitive nivis), Old Irish snechta, Welsh nyf, Lithuanian sniegas, Old Prussian snaygis, Old Church Slavonic snegu, Russian snieg', Slovak sneh "snow"). The cognate in Sanskrit, snihyati, came to mean "he gets wet." As slang for "cocaine" it is attested from 1914.
snow (v.): c.1300, replacing Old English sniwan, which would have yielded modern snew (which existed as a parallel form until 17c. and, in Yorkshire, even later), from the root of snow (n.).
Also þikke as snow þat snew,
Or al so hail þat stormes blew.
[Robert Mannyng of Brunne, transl. Wace's "Chronicle," c.1330]
The figurative sense of "overwhelm" is 1880, American English, in phrase to snow (someone) under. Snow job "strong, persistent persuasion in a dubious cause" is World War II armed forces slang, probably from the same metaphoric image.
snowball (n.): c.1400, from snow (n.) + ball (n.). Snowball's chance (in hell) is recorded by 1910.
snowball (v.): "to make snowballs," 1680s, from snowball (n.); sense of "to throw snowballs at" (someone) is from 1850. Meaning "to increase rapidly" is attested from 1929, though the image of a snowball increasing in size as it rolls along had been used since at least 1613, and a noun sense of "a pyramid scheme" is attested from 1892. Related: Snowballed; snowballing.
snowflake (n.): 1734, from snow (n.) + flake (n.).
snowman (n.): 1827, from snow (n.) + man (n.).
snowmobile (n.): 1931, in reference to Admiral Byrd's expedition, from snow (n.) + ending from automobile, etc.
snowplow (n.): 1792, first mentioned in a New Hampshire context, from snow (n.) + plow (n.).
snowshoe (n.): 1670s, from snow (n.) + shoe (n.). Related: Snowshoes.
snowy (adj.): Old English snawig; see snow (n.) + -y (2). Related: Snowiness.
snub (v.): mid-14c., "to check, reprove, rebuke," from Old Norse snubba "to curse, scold, reprove." Meaning "treat coldly" appeared early 18c. Related: Snubbed; snubbing.
snub (adj.): "short and turned up" (of the nose), 1724, from snub (v.). The connecting notion is of being "cut short."
snudge (n.): "a miser, a mean avaricious person," 1540s, "very common from c.1550-1610" [OED].
snuff (v.1): "to cut or pinch off the burned part of a candle wick," mid-15c., from noun snoffe "burned part of a candle wick" (late 14c.), of unknown origin, perhaps related to snuff (v.2). The meaning "to die" is from 1865; that of "to kill" is from 1932; snuff-film, urban legend, is from 1975.
snuff (v.2): "draw in through the nose," 1520s, from Dutch or Flemish snuffen "to sniff, snuff," related to Dutch snuiven "to sniff," from Proto-Germanic *snuf- (cf. Middle High German snupfe, German Schnupfen "head-cold"), imitative of the sound of drawing air through the nose. Related: Snuffed; snuffing.
snuff (n.): "powdered tobacco to be inhaled," 1680s, from Dutch or Flemish snuf, shortened form of snuftabak "snuff tobacco," from snuffen "to sniff, snuff" (see snuff (v.2)). The practice became fashionable in England c.1680. Snuff-box is attested from 1680s.
snuffle (v.): 1580s, from Dutch or Flemish snuffelen "to sniff about, pry," related to Dutch and Flemish snuffen "to sniff" (see snuff (v.2)). Related: Snuffled; snuffling.
snug (adj.): 1590s, "compact, trim" (of a ship), perhaps from a Scandinavian source, cf. Old Norse snoggr "short-haired," Swedish snygg, Danish snøg "neat, tidy." Sense of "in a state of ease or comfort" first recorded 1630. Meaning "fit closely" is first found 1838.
snuggle (v.): 1680s, frequentative form of snug. Related: Snuggled; snuggling.
so (adv.): Old English swa, swæ "in this way," from Proto-Germanic *swa (cf. Old Saxon, Middle Dutch, Old High German so, Old Norse sva, Danish saa, Swedish så, Old Frisian sa, Dutch zo, German so "so," Gothic swa "as"), from PIE reflexive pronomial stem *s(w)o- (cf. Greek hos "as," Old Latin suad "so," Latin se "himself").
The adverb so at the beginning of a sentence ('So I'll pay for it!'), probably of Yiddish origin, occurs frequently in conversation. [M.Pei, "Story of English," 1952]
So? as a term of dismissal is attested from 1886 (short for is that so?); so what as an exclamation of indifference dates from 1934. So-so "mediocre" is from 1520s; so-and-so is from 1596 meaning "something unspecified;" first recorded 1897 as a euphemistic term of abuse.