Etymology
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piece (n.2)

"a person, an individual," c. 1300, from piece (n.1), but in modern use contemptuous and commonly of women; the meaning "person regarded as a sex object" is by 1785. Compare piece of ass under ass (n.2); human beings colloquially have been piece of flesh from 1590s; also compare Latin scortum "bimbo, anyone available for a price," literally "skin."

PIECE. A wench. A damned good or bad piece; a girl who is more or less active and skilful in the amorous congress. Hence the (Cambridge) toast, may we never have a PIECE (peace) that will injure the constitution. [Dictionary of Buckish Slang, University Wit and Pickpocket Eloquence, London, 1811] 
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donkey (n.)

familiar term for an ass, 1785, also donky, donkie, originally slang or dialectal, of uncertain origin. Perhaps a diminutive from dun "dull gray-brown" (from Middle English donned, past participle of donnen "to lose color, fade, from Old English dunnian). Compare Dunning, name of a (dun) horse (mid-14c.), and see dun (adj.). The form perhaps was influenced by monkey.

Or perhaps it is from a familiar form of the proper name Duncan applied to an animal (compare dobbin). The older English word was ass (n.1). Applied to stupid, obstinate, or wrong-headed persons by 1840. In mechanics, used of small or supplementary apparatus from mid-19c. (donkey-engine, donkey-pump, etc.). Short form donk is by 1916.

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burdon (n.)

mule born of a horse and a she-ass, late 14c., from Latin burdonem.

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bray (n.)

"a harsh cry," especially that of an ass, c. 1300, from bray (v.).

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hinny (n.)

"a mule got from a she-ass by a stallion," 1680s, from Latin hinnus, from Greek innos, ginnos, of unknown origin.

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Ned 

masc. proper name, a familiar abbreviation of Edward. Related: Neddy. From 1790 as the "an ass or donkey."

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LMAO 

by 1997, online abbreviation of laughing my ass off. Related: LMFAO (by 2000).

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Balaam 

Biblical prophet (wicked, but not false) whose story is told in Numbers xxii-xxiv; figurative of "one who makes profession of religion for the sake of gain" from 1640s. Balaam's ass speaks in a human voice in Numbers xxii ("And the ass said unto Balaam, Am not I thine ass, upon which thou hast ridden ever since I was thine unto this day? was I ever wont to do so unto thee? and he said, Nay."). In old newspaper jargon Balaam came to be used for paragraphs regarding marvelous or incredible events, used to fill out short columns (1826). The name is of uncertain origin.

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T and A (n.)

1972, short for tits and ass (a phrase attributed to Lenny Bruce), in reference to salacious U.S. mass media; earlier it was medical shorthand for "tonsils and adenoids" (1942).

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