poor quality, unentertaining, uninteresting, inappropriate conversation.
ALternatives include "shit chat" "terrible chat" "no chat"
Guy 1: I'm going to have a word with that girl over there
Guy 2: Don't bother man - she's got bad chat
Person 1: Your dad's the only parent i know who doesn;t have really bad chat
Person 2: i know, he is awsome when he's plastered!