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English definition of “wise guy”

wise guy

noun [C] uk   (US offensive wise ass) informal us  
someone who is always trying to seem more clever than anyone else in a way that is annoying: Okay, wise guy, if you're so damned smart, you can tell everyone how it's done!
wise-guy
adjective [before noun] uk   /ˈwaɪz.ɡaɪ/ (US offensive wise-ass) us  
wise-guy humour
(Definition of wise guy from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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