A meathead can be anyone of combo of the following things:
1. Someone who is muscular and slower in the
brain.
2. Someone who marinates their
head in sauce.
3. Someone who likes to put their heads in a grill of some kind (Ex. Barbeque, George Forman Grill, ect.)
4. Someone who is a complete fucking
idiot.
A: Yo look at that guy, he's jacked!
B:
Ya, but he's a fucking meathead though.
A: Why is that
idiot grilling his own
head?
B: Probably cause he's a fucking meathead.