Definition of guy noun from the Oxford Advanced American Dictionary

      

    guy

     noun
    noun
    NAmE//ɡaɪ//
     
     
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  1. 1 [countable] (informal) a man a big/nice/tough guy an Italian guy At the end of the movie, the bad guy gets shot. see also fall guy, wise guy
  2. 2 guys [plural] (informal) a group of people of either sex Come on,you guys, let's get going!
  3. 3 (also guy rope) [countable] a rope used to keep a pole or tent in a vertical position
  4. Idioms
    Mr. Nice Guy(informal)
     
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    a way of describing a man who is very honest and thinks about the wishes and feelings of other people I was tired of helping other people. From now on it was no more Mr. Nice Guy (= I would stop being pleasant and kind).
See the Oxford Advanced Learner's Dictionary entry: guy