A derogatory term for a stupid or thick-headed person, using 'chunk' (a thick piece) combined with 'head' to suggest density and dullness.
Informal English compound word: 'chunk' (a thick piece) + 'head' (the seat of thinking). Creates an insult by comparing the person's brain capacity to a thick, heavy block.
This is a creative insult because it works visually—you can picture someone with a literal block for a head—yet it fell out of use because other insults took over; it's the kind of creative insult that probably worked better when said in a school playground than as a permanent slur.
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