1.To thump someone's crotch.

2.To thrust your crotch in a manner that will knocks on one's door.
Brahh, this St.Patrick's Day we should totally go out crotch knocking.
by Dr.Mustachio January 1, 2011
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The act of swinging one's fist into another's crotch for the sake of comedy or business purposes.
I had to crotch-knock three people to get into the porto-potty.
by Jim Hancock May 11, 2005
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