Meathead

noun

1. An ungainly, dull or stupid person; someone who is lazy, disrespectful and/or whose beliefs and philosophies clash with another.
2. A large, muscular, stupid male, especially an athlete.

   "Gary was a hulking meathead who, when he wasn't playing football, was either hunting, fishing or getting drunk and rowdy in some topless bar."

3. A member of the Canadian Forces Military Police.