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2.
The act of using your chin to have sex
Bobby had chin sex with Suzie on Tuesday.
by Beckzie December 20, 2006
 
1.
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