Stupid, slow-thinking, or acting like a beefhead; having the qualities of being strong but unintelligent.
Adjective form of beefhead, adding the suffix '-ed' to create a descriptive term; 20th-century American slang.
The '-ed' suffix here works differently than usual—'beefheaded' doesn't mean 'having a beef head' but rather 'characterized by being a beefhead,' showing how English constantly repurposes suffixes for insults.
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