Wiktionary
n. 1 A variation of the game of pool. 2 (context slang English) The act of manipulating the penis and testicles through a trouser pocket; masturbation.
Wikipedia
Pocket Pool is a game released for the PlayStation Portable gaming system, developed by Hyper-Devbox Japan and published by both Conspiracy Entertainment and Eidos. The game was originally expected to have the Girls Gone Wild license but the publishers were unable to negotiate terms.
Usage examples of "pocket pool".
He stopped a few steps away and stood looking down at me, his hands thrust into his baggy gray slacks, playing pocket pool or fiddling with his spare coins or whatever it was he did when wearing that thoughtful expression on his face.
He didn't want to be here under this gray washtub sky, smelling New York exhaust, one hand constantly playing pocket pool with his wallet to make sure it was still there.