(slang, sometimes, derogatory) A very intelligent and usually studious, erudite person.
With all the brainiacs in the world ... you'd think somebody would come up with a sunblock for ice cream.
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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.