An American simile meaning spectacularly, almost impressively stupid. The comparison to dirt — the most ordinary, inert substance imaginable — underscores that the person being described has achieved a kind of peak dullness. Used affectionately among friends or as a pointed insult depending on tone, 'dumb as dirt' is a timeless piece of folksy American trash talk that's found its way into everyday conversation across the English-speaking world.
I can't believe he locked his keys in the car again — that man is dumb as dirt.
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(slang, simile) Extremely stupid.
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Regional slang from around the English-speaking world — British, Australian, Irish, Caribbean, Nigerian, Filipino, AAVE, and the hyphenated-English dialects that make the internet sound local.
See all Regional & Other slang on Slangora.