wise guy
noun /ˈwaɪz ɡaɪ/
/ˈwaɪz ɡaɪ/
- (especially North American English, informal, disapproving) a person who speaks or behaves as if they know more than other people synonym know-all
- OK, wise guy, what do we do now?
- (US English, slang) a member of the Mafia