yackety-yak Syllabification: (yack·e·ty-yak)Pronunciation: /ˌyakətē ˈyak/ (also yackety-yack)Definition of yackety-yak noun & verb another term for yak2.Origin: 1950s: imitativeyackety-yak in other Oxford dictionaries Definition of yackety-yak in the British & World English dictionary