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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
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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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