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The act of inserting your penis into a girl's butt chin and sliding it up in down in between the crevices.
Guy 1: Yo girl has a massive butt chin
Guy 2: Yeah i know we have chin sex all the time and i cum up her nose.
by carltoncumsalot July 13, 2010
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When you put your willy under a bbw's double chin and pork her until you jizzy jazz.
Chin sex:
Guy: Hey you fine fluffy thang, I find your chin chinsatiable, mind if my dong rides your neck all night long?

Sexy bbw: mmmmm yes daddy, do yo thang, I'll just be laying here eating bon bons and tweaking my nippular area.
by TheNotoriousPIG February 17, 2018
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