musclebrain

From muscle +‎ brain.

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musclebrain (plural musclebrains)

1. (US) A person who actively participates in physical sports, possibly highly skilled in sports, but does not do well in academic activities, like math and science.
2. (US, slang, derogatory) A large, strong, but inept, bumbling, buffoonish or unintelligent man.

• (participant in physical sports): athlete, jock
• (idiot): bruiser, dumbbell, moron, buffoon, dimwit, pinhead, meathead, birdbrain, peabrain, goon, dummy, dipstick, idiot