mark, an affectionate way of calling someone an idiot/asshole/numpty/sillybilly - similair to poohead. Alternatives include jobbyfeatures/jobbyface. Term of endearment
Allan: How long have you had the car?
Caller: Well, it's 1964.
Allan: Well what do you expect, for crying out loud? 24 years and they're gonna keep making the paint?! Don't talk crap! Go away, ya gobhead, 24 piggin' years?!