Yackety-yak is an informal phrase used to describe someone who talks a lot. The term is derived from the sound made by a jackass, which is similar to the sound of someone talking incessantly. The crossword solutions for the term Yackety-yak are JAW (3 letters), NATTER (6 letters), and GAB (3 letters). JAW refers to the act of talking, NATTER means to talk idly or incessantly, and GAB is another word for talking. All three words can be used to describe someone who talks a lot.