It is when you literally do not care, and cannot be bothered to to shout at the person who has annoyed you. You do not wish to personally offend them so using this subtle but effective acronym will definitely suffice.
Mainly used between female-male conversations, used by teenagers most of the time.
Person 1: Heyy! do you remember when James cheated on me?
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)