A person who is such a pervert and a loser that they have the characteristics of both Beavis and Butthead.
Beavhead: Uh, hey baby, uhuhuhuh.
Girl: Piss off you stupid beavhead.
Beavhead: Would you like some TP for your sexy bunghole? Uhuhuhuh.
The homosexual ship name between two animated characters named Beavis and Butt-head that aired on MTV; pretty much self-explanatory.
Person A: Dude I ship Beavhead so bad!!
Person B: Like from that show you'll never shut up about...? Aren't they brothers?
Person: No they aren't brothers! Anyway they give each other soft glances guys, trust.
Person B: Um ok.... *walks away awkwardly*