yack(noun, verb) noun1. noisy talkSimilar word(s): cackle, chatter, yakDefinition categories: communication, talk, talking verb1. talk incessantly and tiresomelySimilar word(s): jawDefinition categories: communication, mouth, speak, talk, utter, verbalise, verbalizeSentences with yack as a verb:- I moved to another carriage on the train because the first one was full of people yacking on mobile phones.