yacket,v.slang.|ˈjækɪt| [f. yackety int.] intr.= yack v. So ˈyacketingppl. a. [1953: see yackety-yacketing vbl.n.andppl. a.]1958P. de Vries Mackerel Plaza 153 All this yacketing oratory.1969New Yorker 29 Nov. 51/3 We warn them, we yacket away night and day..but they never learn.