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English definition of “smart mouth”

smart mouth

noun [C usually singular] uk   US informal us  
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
adjective uk   /ˌsmɑːtˈmaʊðd/ us    /ˌsmɑːrt-/
a smart-mouthed little bratRude and cheekyRelating to sex and sexual desire
(Definition of smart mouth from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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