(chiefly, US, slang, derogatory, sometimes, humorous, often, as a term of address) A slow-witted, unresponsive, or inept person (usually male).
Tell numbnuts over there to wake up and pay attention to his work.
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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.