Gerald on Joe Schmoe plays J-Roc on Trailer Park Boys. I read that he's still with the show and is actually a writer for it now too.
His character is a wannabe rapper. He's hilarious, but he's a complete joke and not so smart. On last week's episode he wanted to pretend he was still in jail (rather than getting community service like he did) to up his street cred.
Here's a picture of the cast. If you watch Joe Schmoe you can pick him out easily.