Definition of wise guy noun from the Oxford Advanced American Dictionary

     

    wise guy

     noun
    noun
     
     
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  1. 1 (informal) (disapproving) a person who speaks or behaves as if they know more than other people synonym know-it-all OK, wise guy, what do we do now?
  2. 2 (slang) a member of the Mafia
See the Oxford Advanced Learner's Dictionary entry: wise guy