When two dudes, who are down to
pound, bump their buttholes together in order to reach a mutual climax. This would be comparable to when women participate in what is called
scissoring, where they
smash the vaginas together until the juice comes out, but in this case.... It's just poop.
Dude, I was just wanting to
play a video
game, but if you want to do do some piping, I'd be down to
pound.