"Hole in the corner pocket, every time. This was all about the gameplay. Nobody ever finished the last pro level challenge, EXCEPT ME!"
EXsorbeo site

Pocket Pool is a game released for the EXsorbeo console in Grand Theft Auto: San Andreas. It presumably is a video game variant of pool. "Pocket pool" is a term for masturbation.

According to the EXsorbeo site, the creator of the site was the only person to ever complete the last pro level challenge.