Definition of mouthy adjective from the Oxford Advanced American Dictionary

 

mouthy

 adjective
adjective
NAmE//ˈmaʊθi//
 
, NAmE//ˈmaʊði//
 
(informal)(disapproving)
 
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used to describe a person who talks a lot, sometimes expressing their opinions strongly and in a rude way mouthy teenagers
See the Oxford Advanced Learner's Dictionary entry: mouthy