1. (slang) An ungainly, dull or stupid person; someone who is lazy, disrespectful and/or whose beliefs and philosophies clash with another.
2. (slang) A large, muscular, stupid male, especially an athlete. A jock. A brute.
- 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. (military, slang, Canada) a member of the Canadian Forces Military Police.