piece of ass/tail

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piece of ass/tail

An act of sexual intercourse. Both terms, dating from the early 1900s, are considered vulgar slang. A version of a 1918 song popular in the military, “Mademoiselle from Armentieres,” had it: “Oh, Captain, may I have a pass? For I want to get a piece of ass.”
See also: ass, of, piece, tail