To rub your taint on to your hand and slap a chum in the face.
Billy taint slapped eddie in the face, leaving his face sweaty and poopy.
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When a guy opens his stance then thrusts his hips back and forth, slapping his butt with his penis and balls.
Girl 1: "I just watched Big Brother 9, and i must admit that 'Crazy James' is smoking hot"
Girl 2: "He doesn't do it for me, but his taint slapping was wicked though, he must have a large penis to do that and slap his ass with it"
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1. A formal, or informal move to establish dominance.
2. A greeting.
I walked up and taint slapped the shit out of him. Now we go to dairy queen sometimes.
When your mother in law walks in and catches your balls in the air slapping her daughters taint .
Or when you are pounding that ass and your balls are slapping against the taint
I walked in and caught my brother and his girlfriend slapping taint.