taint slapping 

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"

taint slapping by Lise Reed February 26, 2008

slapping taint 

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.

slapping taint by DirtySouth305 May 7, 2018