(originally, _, AAVE, US, slang, vulgar) grown-up; adult; often used in reproach of an adult's immaturity, or, conversely, in assertion of maturity.
They call it a sport, but to me it looks like a bunch of grown-ass men running around like children.
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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.