1948, shortening of bebop or rebop. The musical movement had its own lingo, which was in vogue in U.S. early 1950s. "Life" magazine [Sept. 29, 1952] listed examples of bop talk: crazy "new, wonderful, wildly exciting;" gone (adj.) "the tops--superlative of crazy;" cool (adj.) "tasty, pretty;" goof "to blow a wrong note or make a mistake;" hipster "modern version of hepcat;" dig "to understand, appreciate the subtleties of;" stoned "drunk, captivated, ecstatic, sent out of this world;" flip (v.) "to react enthusiastically."
"to hit, strike, punch," 1931, imitative. As a noun from 1934. Sense of "play bop music, play (a song) in a bop style" is from 1948, from bop (n.). It soon came to mean "do any sort of dance to pop music" (1956). Related: Bopped; bopping.
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