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English definition of “smart mouth”

smart mouth

noun [C usually singular]     US informal
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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