A derogatory term for a stupid or thick-headed person, or a person whose head resembles a beetle's in shape or structure.
Compound word from 'beetle' and 'head,' combining 'bitela' (beetle) with Old English 'heafod' (head)—insulting compounds comparing people to insects have ancient roots.
Calling someone a 'beetlehead' seems oddly specific, but beetles have massive heads relative to body size and thick outer skulls—so comparing a dense person's head to one made perfect sense to medieval English speakers.
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