grown-ass adjective1 •(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.Your mother is a grown-ass woman, and if she doesn't like you living your life for yourself rather than her, she can deal with it.
