Definitions for backtalk
sass, sassing, backtalk, back talk, lip, mouth(noun)
an impudent or insolent rejoinder
"don't give me any of your sass"
Verbal impudence or argumentative discourse, given in response.
Don't give me any backtalk; just go clean your room.
To respond in an aggresively disputatious, often sarcastic or outright insolent manner.
Peter was sent to detention for backtalking the teacher.