Etymology
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jive (v.1)

the word appears in 1928 in American-English, meaning "to deceive playfully," also with noun sense "empty, misleading talk" and as the name of a style of fast, lively jazz and dance music; from African-American vernacular and probably of African origin (compare Wolof jev, jeu "talk about someone absent, especially in a disparaging manner"). Related: Jived; jiving.

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jam (n.2)
"a tight pressing between two surfaces," 1806, from jam (v.). Sense of "machine blockage" is from 1890, which probably led to the colloquial meaning "predicament, tight spot," first recorded 1914. Jazz meaning "short, free improvised passage performed by the whole band" dates from 1929, and yielded jam session (1933); but this is perhaps from jam (n.1) in sense of "something sweet, something excellent."
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traditional (adj.)

1590s, "observing traditions;" c. 1600, "handed down as tradition," from tradition + -al (1). In reference to jazz, from 1950. Related: Traditionally; traditionalist.

There is no hope in returning to a traditional faith after it has once been abandoned, since the essential condition in the holder of a traditional faith is that he should not know he is a traditionalist. [Al Ghazali]
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schmaltz (n.)
"banal or excessive sentimentalism," 1935, from Yiddish shmalts, literally "melted fat," from Middle High German smalz, from Old High German smalz "animal fat," related to smelzan "to melt" (see smelt (v.)). Modern German Schmalz "fat, grease" has the same figurative meaning. First mentioned in English as "a derogatory term used to describe straight jazz" ["Vanity Fair," Nov. 1935].
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wah-wah 
1926, in jazz slang, in reference to the effect on brass instruments made by manipulating the mute; of imitative origin. Later also in reference to an electric guitar effect. As an imitation of the sound of a baby crying, it is recorded from 1938. Wah-wah pedal is recorded from 1969. Compare Chinook jargon wawa "talk, speak, call, ask, sermon, language;" Cree (Algonquian) wehwew "goose," Lenape (Algonquian) wava "snow goose," all probably of imitative origin.
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soul (n.2)
"instinctive quality felt by black persons as an attribute," 1946, jazz slang, from soul (n.1). Also from this sense are soul brother (1957), soul sister (1967), soul food (1957), etc. Soul music, essentially gospel music with "girl," etc., in place of "Jesus," first attested 1961; William James used the term in 1900, in a spiritual/romantic sense, but in reference to inner music.
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fake 

of unknown origin; attested in London criminal slang as adjective (1775, "counterfeit"), verb (1812, "to rob"), and noun (1851, "a swindle;" of persons 1888, "a swindler"), but probably older. A likely source is feague "to spruce up by artificial means," from German fegen "polish, sweep," also "to clear out, plunder" in colloquial use. "Much of our early thieves' slang is Ger. or Du., and dates from the Thirty Years' War" [Weekley]. Or it may be from Latin facere "to do." Century Dictionary notes that "thieves' slang is shifting and has no history."

The nautical word meaning "one of the windings of a cable or hawser in a coil" probably is unrelated, from Swedish veck "a fold." As a verb, "to feign, simulate" from 1941. To fake it is from 1915, jazz slang; to fake (someone) out is from 1940s, originally in sports. Related: Faked; fakes; faking.

The jazz musician's fake book is attested from 1951. Fake news "journalism that is deliberately misleading" is attested from 1894; popularized in the 2016 U.S. presidential campaign.

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groovy (adj.)
1850, "pertaining to a groove," from groove (n.) + -y (2). Slang sense of "first-rate, excellent" is 1937, American English, from jazz slang phrase in the groove (1932) "performing well (without grandstanding)." As teen slang for "wonderful," it dates from c. 1941; popularized 1960s, out of currency by 1980. Earlier colloquial figurative sense was "having a tendency to routine, inclined to a specialized and narrow way of life or thought" (1882). Related: Grooviness.
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cool (adj.)

Old English col "not warm" (but usually not as severe as cold), "moderately cold, neither warm nor very cold," also, figuratively, of persons, "unperturbed, undemonstrative, not excited or heated by passions," from Proto-Germanic *koluz (source also of Middle Dutch coel, Dutch koel, Old High German chuoli, German kühl "cool," Old Norse kala "be cold"), from PIE root *gel- "cold; to freeze."

Attested in a figurative sense from early 14c. as "manifesting coldness, apathy, or dislike." Applied since 1728 to large sums of money to give emphasis to amount. Meaning "calmly audacious" is from 1825.

Slang use of cool for "fashionable" is by 1933, originally African-American vernacular; its modern use as a general term of approval is from the late 1940s, probably via bop talk and originally in reference to a style of jazz; the word is said to have been popularized in jazz circles by tenor saxophonist Lester Young (1909-1959). Cool-headed "not easily excited or confused" is from 1742.

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jump (n.)
1550s, "an act of jumping," from jump (v.). Figurative meaning "sudden abrupt rise" is from 1650s. Meaning "abrupt transition from one point to another" is from 1670s. Sense of "a parachute descent" is from 1922. Meaning "jazz music with a strong beat" first recorded 1937, in Count Basie's "One O'Clock Jump." Jump suit "one-piece coverall modeled on those worn by paratroopers and skydivers" is from 1948. To get a jump on "get ahead, get moving" is from 1910, perhaps a figurative use from the jump-spark that ignites an engine.
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