dirty eight ball

The act of positioning ones self and exposing ones genitals to distract an opposing player that is engaged in shooting the eight ball in a game of bar pool.

Egan: Hey did you win that game?
Ray: Yeah, guy was going for the win so I gave him a dirty eight ball and he scratched!
Egan: Haha fuckin right!
Ray: Fuckin A, I won two bucks!