Etymology
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Mae West 

type of inflatable life jacket, 1940, military slang, in reference to the screen name of the buxom U.S. film star (1892-1980).

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Methedrine (n.)

1939, proprietary name of a brand of methamphetamine (by Wellcome Ltd.); the name is compounded from elements of methyl + benzedrine. Slang abbreviation meth is attested from 1967.

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Jerry (n.)

World War I British Army slang for "a German; the Germans," 1919, probably an alteration of German based on the male nickname Jerry, popular form of Jeremy. But it also is said to be from the shape of the German helmet, which was thought to resemble a jerry, British slang for "chamber pot, toilet" (1850), this being probably an abbreviation of jeroboam, which is attested in this sense from 1827. Compare jerry-hat "round felt hat" (1841).

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Joe 

pet-form of Joseph (q.v.). Meaning "generic fellow, man" is from 1846. Used in a wide range of invented names meaning "typical male example of," for example Joe college "typical college man" (1932); Joe Blow "average fellow" is U.S. military slang, first recorded 1941. "Dictionary of American Slang" lists, among other examples, Joe Average, Beige, Lunch Bucket, Public, Sad, Schmoe, Six-pack, Yale, Zilch

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Betty 

fem. pet name, from Bet, shortened from Elizabeth, + -y (3). Also in old slang (by 1857), "man who interferes with the domestic duties of women" [Century Dictionary, 1889].

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Coke 

soft drink, 1909, a popular shortening of the brand name Coca-Cola, perhaps influenced by the earlier slang use of coke for cocaine (another popular early name for the soft drink was dope).

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Darby 

masc. personal name, representing a southern England pronunciation of Derby. Also see Joan. Darbies, slang for "handcuffs," is by 1670s, implied in other forms from 1570s, but the association is obscure.

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Flynn 

surname, from Irish flann "red." Rhyming phrase in like Flynn is 1940s slang, said to have originated in the U.S. military, perhaps from alleged sexual exploits of Hollywood actor Errol Flynn (1909-1959).

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Che 

nickname of Argentine Marxist revolutionary Ernesto Guevara (1928-1967), given to him by Cuban exiles in Guatemala in mid-1950s, from his dialectal use of Argentine che, a slang filler word in speech.

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Moll 

female proper name, shortened form of Mollie, Molly, itself a familiar of Mary. Used from c. 1600 for "prostitute," but in low slang by early 19c. it also meant "female companion not bound by ties of marriage, but often a life-mate" [Century Dictionary]. It became a general word for "woman" in old underworld slang, for instance Moll-buzzer "pickpocket who specializes in women;" Moll-tooler "female pick-pocket." U.S. sense of "a gangster's girlfriend" is by 1923.

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