donkey Look up donkey at Dictionary.com
1785, slang, perhaps from dun "dull grey-brown," the form perhaps infl. by monkey. Or possibly from a familiar form of Duncan (cf. dobbin). The older Eng. word was ass.
ass (2) Look up ass at Dictionary.com
slang for "backside," first attested 1860 in nautical slang, in popular use from 1930; chiefly U.S.; from dial. variant pronunciation of arse (q.v.). The loss of -r- before -s- attested in several other words (e.g. burst/bust, curse/cuss, horse/hoss, barse/bass). Indirect evidence of the change from arse to ass can be traced to 1785 (in euphemistic avoidance of ass "donkey" by polite speakers) and perhaps to Shakespeare, if Nick Bottom transformed into a donkey in "A Midsummer Night's Dream" (1594) is the word-play some think it is. Meaning "woman regarded as a sexual object" is from 1942.
easel Look up easel at Dictionary.com
1590s, from Du. ezel "easel," originally "ass," from M.Du. esel, from L. asinus "ass" (see ass (1)); the comparison being of loading a burden on a donkey and propping up a painting or canvas on a wooden stand.
burro Look up burro at Dictionary.com
1800, from Sp. burrico "donkey," from L.L. burricus "small, shaggy horse," probably from burrus "reddish-brown," from Gk. pyrros "flame-colored, yellowish-red," from pyr (gen. pyros) "fire."
ass (1) Look up ass at Dictionary.com
beast of burden, O.E. assa (Old Northumbrian assal, assald), prob. from O.Celt. *as(s)in "donkey," which (with Ger. esel, Goth. asilus, Lith. asilas, O.C.S. osl) is ultimately from L. asinus, probably of Middle Eastern origin (cf. Sumerian ansu). Since ancient Gk. times, in fables and parables, the animal typifies clumsiness and stupidity (hence asshead, 1550, etc.). To make an ass of oneself is from 1590. Asses' Bridge (c.1780), from L. Pons Asinorum, is fifth proposition of first book of Euclid's "Elements."
mule (1) Look up mule at Dictionary.com
"offspring of donkey and horse," O.E. mul, O.Fr. mul (fem. mule), both from L. mulus (fem. mula) "a mule," probably from a pre-Latin Mediterranean language.
"The mule combines the strength of the horse with the endurance and surefootedness of the ass, and is extensively bred for certain employments for which it is more suited than either; it is ordinarily incapable of procreation. With no good grounds, the mule is a proverbial type of obstinacy." [OED]
Properly, the offspring of a he-ass and a mare; that of a she-ass and a stallion is technically a hinny. Used allusively of hybrids and things of mixed nature. As a type of spinning machine, attested from 1797. Meaning "stubborn person" is from 1848; that of "narcotics smuggler or courier" first attested 1935. O.Fr. mul was replaced in Fr. by dim. form mulet, hence muleteer "mule driver" (1538), from Fr. muletier.
bawd Look up bawd at Dictionary.com
a complicated word of uncertain history. First attested late 15c., "lewd person" (of either sex; since c.1700 applied only to women), probably from baude-strote "procurer of prostitutes" (mid-14c.), which may be from M.E. bawde (adj.) "merry, joyous," from O.Fr. baud "gay, licentious" (from Frankish bald "bold"). It would not be the first time a word meaning "joyous" had taken on a sexual sense. The sense evolution shading from "bold" to "lewd" is not difficult; cf. O.Fr. baudise "ardor, joy, elation, act of boldness, presumption;" baudie "elation, high spirits," fole baudie "bawdry, shamelessness." The O.Fr. word also is the source of Fr. baudet "donkey," in Picardy dialect "loose woman." The second element in baude-strote would be trot "one who runs errands," or Germanic *strutt (see strut). But OED doubts all this. There was an O.Fr. baudestrote, baudetrot of the same meaning (13c.), and this may be the direct source of M.E. baude-strote. The obsolete word bronstrops "procuress," frequently found in Middleton's comedies, probably is an alt. of baude-strote.
fuck Look up fuck at Dictionary.com
a difficult word to trace, in part because it was taboo to the editors of the original OED when the "F" volume was compiled, 1893-97. Written form only attested from early 16c. OED 2nd edition cites 1503, in the form fukkit; earliest appearance of current spelling is 1535 -- "Bischops ... may fuck thair fill and be vnmaryit" [Sir David Lyndesay, "Ane Satyre of the Thrie Estaits"], but presumably it is a much more ancient word than that, simply one that wasn't likely to be written in the kind of texts that have survived from O.E. and M.E. Buck cites proper name John le Fucker from 1278. The word apparently is hinted at in a scurrilous 15c. poem, titled "Flen flyys," written in bastard L. and M.E. The relevant line reads:
Non sunt in celi
quia fuccant uuiuys of heli
"They [the monks] are not in heaven because they fuck the wives of Ely." Fuccant is pseudo-L., and in the original it is written in cipher. The earliest examples of the word otherwise are from Scottish, which suggests a Scandinavian origin, perhaps from a word akin to Norw. dial. fukka "copulate," or Swedish dial. focka "copulate, strike, push," and fock "penis." Another theory traces it to M.E. fkye, fike "move restlessly, fidget," which also meant "dally, flirt," and probably is from a general North Sea Gmc. word, cf. M.Du. fokken, Ger. ficken "fuck," earlier "make quick movements to and fro, flick," still earlier "itch, scratch;" the vulgar sense attested from 16c. This would parallel in sense the usual M.E. slang term for "have sexual intercourse," swive, from O.E. swifan "to move lightly over, sweep" (see swivel). Chronology and phonology rule out Shipley's attempt to derive it from M.E. firk "to press hard, beat." As a noun, it dates from 1680. French foutre and Italian fottere look like the Eng. word but are unrelated, derived rather from L. futuere, which is perhaps from PIE base *bhau(t)- "knock, strike off," extended via a figurative use "from the sexual application of violent action" [Shipley; cf. the sexual slang use of bang, etc.]. Popular and Internet derivations from acronyms (and the "pluck yew" fable) are merely ingenious trifling. The O.E. word was hæman, from ham "dwelling, home," with a sense of "take home, co-habit." Fuck was outlawed in print in England (by the Obscene Publications Act, 1857) and the U.S. (by the Comstock Act, 1873). The word may have been shunned in print, but it continued in conversation, especially among soldiers during WWI.
"It became so common that an effective way for the soldier to express this emotion was to omit this word. Thus if a sergeant said, 'Get your ----ing rifles!' it was understood as a matter of routine. But if he said 'Get your rifles!' there was an immediate implication of urgency and danger." [John Brophy, "Songs and Slang of the British Soldier: 1914-1918," pub. 1930]
The legal barriers broke down in the 20th century, with the "Ulysses" decision (U.S., 1933) and "Lady Chatterley's Lover" (U.S., 1959; U.K., 1960). Johnson excluded the word, and fuck wasn't in a single English language dictionary from 1795 to 1965. "The Penguin Dictionary" broke the taboo in the latter year. Houghton Mifflin followed, in 1969, with "The American Heritage Dictionary," but it also published a "Clean Green" edition without the word, to assure itself access to the lucrative public high school market. The abbreviation F (or eff) probably began as euphemistic, but by 1943 it was being used as a cuss word, too. In 1948, the publishers of "The Naked and the Dead" persuaded Norman Mailer to use the euphemism fug instead. When Mailer later was introduced to Dorothy Parker, she greeted him with, "So you're the man who can't spell 'fuck' " [The quip sometimes is attributed to Tallulah Bankhead]. Hemingway used muck in "For whom the Bell Tolls" (1940). The major breakthrough in publication was James Jones' "From Here to Eternity" (1950), with 50 fucks (down from 258 in the original manuscript). Egyptian legal agreements from the 23rd Dynasty (749-21 B.C.E.) frequently include the phrase, "If you do not obey this decree, may a donkey copulate with you!" [Reinhold Aman, "Maledicta," Summer 1977]. Intensive form mother-fucker suggested from 1928; motherfucking is from 1933. Fuck-all "nothing" first recorded 1960. Verbal phrase fuck up "to ruin, spoil, destroy" first attested c.1916. A widespread group of Slavic words (cf. Pol. pierdolić) can mean both "fornicate" and "make a mistake." Flying fuck originally meant "have sex on horseback" and is first attested c.1800 in broadside ballad "New Feats of Horsemanship." For the unkillable urban legend that this word is an acronym of some sort (a fiction traceable on the Internet to 1995 but probably predating that) see here, and also here.