mouthy
From Longman Dictionary of Contemporary Englishmouthymouth‧y /ˈmaʊθi/ adjective informal someone who is mouthy talks a lot and says what they think even if it is rudeExamples from the Corpusmouthy• a mouthy 13-year-old girl• I was mouthy but that was about it.• Like when he'd pushed that mouthy girl under the Whirli Go Round.