Definition of wise guy noun from the Oxford Advanced Learner's Dictionary


    wise guy

    BrE BrE//ˈwaɪz ɡaɪ//
    ; NAmE NAmE//ˈwaɪz ɡaɪ//
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  1. 1(informal, disapproving, especially North American English) 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?
  2. 2(US English, slang) a member of the Mafia
See the Oxford Advanced American Dictionary entry: wise guy