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smart mouth

noun [C usually singular]
 
US informal

Definition

If someone has or is a smart mouth, they speak to other people in a way that shows little respect.Showing arrogance and conceitConfidence and self-assuranceBoasting smart-mouthed
 
 
/ˌsmɑːtˈmaʊðd/ US  /ˌsmɑːrt-/ adjective
a smart-mouthed little bratRude and cheekyRelating to sex and sexual desire
(Definition of smart mouth noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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