1)That gross thin, patchy moustache white-trashy folk get when they are in the pre-FBY(Full Blown Yokel) stages. Often accompanied by a rat tail and/or a shaved head.
2)The above mentioned, but on a nerdy kid...or someone who just looks like they have a pubic hair moustache.
3)The Demise of Scott Tenorman's parents....episode 501.
partygo-er 1: Dude, he looks like a young Steve The Cable Guy with that pubic hair moustache!
Dude 1: He does!
Pubic hair moustache kid: (Runs away crying)