When the top-front area of a pair of jeans descends below the belt, causing a buildup of denim in the croth region that resembles an erection.
guy1: dude, you've got a crotch bubble... snag your button on the top of your belt, that'll fix it.

guy2: oh snap, you're right!
by doombuddy January 27, 2008
The type of fart that comes out of your butt and travels up through your crotch.
Whoa, danny. I just had a crotch bubble!
by The girls with the connection December 28, 2009
The act of blowing bubbles at someone's crotch and making it sound like the got an STD.
I just gave you crotch bubbles with my bubble wond!
by just mee July 13, 2008

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