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boink

[boingk]
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verb (used with or without object) Vulgar Slang.
  1. to have sexual intercourse (with).
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Origin of boink

First recorded in 1980–85; imitative of bouncing or banging
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Word Origin and History for boink

"have sex with; the sex act," slang by c.2000, perhaps an alteration of bonk in its popular sexual sense. Related: Boinked; boinking.

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Online Etymology Dictionary, © 2010 Douglas Harper