dude / doōd/ inf. • n. a man; a guy: if some dude smacked me, I'd smack him back. ∎ a stylish, fastidious man: cool dudes. ∎ a city-dweller, esp. one vacationing on a ranch in the western U.S.• v. [intr.] (dude up) dress up elaborately: [as adj.] (duded) my brother was all duded up in silver and burgundy. DERIVATIVES: dud·ish adj.