Mouthy/ˈmaʊθi/ Definition 1 of 1Pro Tip 1/3Colloquial Use Used more in casual conversation rather than formal or written English. My little brother got grounded for being mouthy with our parents at dinner. Pro Tip 2/3Negative Connotation 'Mouthy' often has a negative tone, suggesting disrespect or rudeness. Her mouthy remarks during meetings are starting to annoy her co-workers. Pro Tip 3/3Possible Offense Calling someone 'mouthy' can be offensive, so use cautiously. I didn't mean to upset you by calling you mouthy; I thought you'd take it as a joke.