Well, that's no moon... I mean, that wasn't a mere stock character from the South Park Universe. That was one of our real life editors, Tom Vogt. Matt did an awesome job impersonating his voice, and he really has a pair of orange Abercrombie & Fitch shorts (that convert into pants, I believe).
One of the best gags we ever pulled at South Park, was convincing Tom that he was fired a few years back. They got a cake (that said "Good Luck Tom") and everything. We even had a card that everyone signed. Greg Postma (Story Board) wrote: "Hey Tom, do those shorts convert into a new job?").
Ah, good times.