Etymology
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bonk (v.)
"to hit," 1931, probably of imitative origin; 1975 in sense of "have sexual intercourse with." Related: Bonked; bonking. As a noun from 1938; in the sexual sense by 1984.
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bonkers (adj.)
"crazy," 1957, British slang, perhaps from earlier naval slang meaning "slightly drunk" (1948), from notion of a thump ("bonk") on the head.
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boink 
"have sex with" (v.); "the sex act" (n.), slang by c. 2000, perhaps an alteration of bonk in its popular sexual sense. Related: Boinked; boinking.
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