- yack⇄noun endless, foolish talk.
Ex. Local stations are either full of yack or turn out gloom by the square yard (Cape Times).
Also, yak. - yack⇄v.i., v.t. to talk endlessly and foolishly; chatter.
Ex. We'll be in your hair all the time, yacking and quarrelling and everything (New Yorker). - yack⇄yack, verb, noun.
(Slang.)