A combination of yacking off and cackling. It can be used as an adjective or verb to refer to a group of young people disturbing public peace through loud speech interlaced with grating laughter.
The chugging of the train, combined with the constant yackling of the five girls seated in front of me, was enough to give any sane person a terrible migraine.
Fogey/fogy /fougi/ sl. (early 18C+, orig. Scot) old-fashioned, stuck-in-the mud.
Person with old fashioned ideas which he is unwilling to change: Come to the disco and stop being such an old fogey!
You think me an old fogeyand an old tory, his thoughtful voice said. I saw three generations since O’Connel’s time. I remember the famine. Do you know that the orange lodges agitated for repeal of the union twenty years before O’Connel did or before the prelates of your communion denounced him as a demagogue? You fenians forget some things. (James Joyce, Ulysses. Penguin Books,1992. p. 38)