From Longman Dictionary of Contemporary Englishbackchatback‧chat /ˈbæktʃæt/ noun [uncountable] British English informal ANSWER/REPLYa rude reply to someone who is telling you what to do SYN backtalk American English None of your backchat – do your homework!
Examples from the Corpus
backchat• They give you any backchat, you take them in.• The comic backchat is often crude and indecent.• I parked behind it and prepared some sarky backchat if the owners turned out to be sightseers.• Well, they're the ones who give you the backchat. 