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smarty-pants

noun [C]
 
 
/ˈsmɑː.ti.pænts/ US  /ˈsmɑːr.t̬i-/ (plural smarty-pants) informal

Definition

someone who wants to appear to be clever: [as form of address] Okay, smarty-pants, you tell me how to do it then.Showing arrogance and conceitConfidence and self-assuranceBoasting
(Definition of smarty-pants noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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