What does boink mean?
Boink is an informal English word whose dominant modern sense is sexual: to have intercourse with someone. It functions chiefly as a transitive verb ('they boinked all night'), though it can also appear as a noun for the act itself. The word belongs to the same family of jokey euphemisms as 'bonk', its close British counterpart, and shares their playful, adolescent register — it signals silliness more than obscenity, which has made it a staple of sitcom dialogue, college humor, and crude-but-harmless banter. Boink also survives in an older, innocent onomatopoeic role, imitating the cartoonish sound of something springing off a surface, as when a character is struck by a rubber mallet. Because of its double life, context matters: in most adult conversation it means sex, but in comics and children's media it remains purely a sound effect. Writers reaching for it should expect raised eyebrows in formal contexts.
To have sexual intercourse with (someone).
"The tabloid claimed the two stars had boinked in a hotel elevator."
Transitive and informal; mildly vulgar but playful in tone.
An instance of sexual intercourse, or the comical sound of a bouncy impact.
"One boink on the head with a foam bat and the villain saw stars."
Used for repeated instances of either the act or the comic sound; rare outside informal speech.
"Every boink of the spring-loaded boxing glove drew laughter from the audience."
'Boink' started life as the sound of something bouncing off a wall — and somehow ended up as one of America's favorite silly words for sex.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of boink
Boink arose in twentieth-century American English, apparently as an onomatopoeic coinage imitating a springy, bouncing impact — the same impulse that produced words like 'boing' and 'bonk'. Its use as comic slang for sexual intercourse developed later, probably by extension from that bouncy, physical imagery, paralleling the independent evolution of British 'bonk' in the same direction. Because the word is an expressive sound-imitation rather than a borrowing, it has no true cognates in other languages or deeper roots to trace.
How boink is actually used
Register is firmly informal and slightly vulgar — fine among friends or in comedy, inappropriate in professional or polite formal writing. The word carries a playful, juvenile connotation rather than a harsh one; it sounds more goofy than obscene. It originated in American English; British speakers typically prefer 'bonk' for the same meaning.
Easily confused with boink
'Bonk' is the chiefly British slang equivalent meaning to have sex with someone, while 'boink' is the more American variant of the same joke; both also imitate a comical bumping sound.