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?
Boys who enjoy yaoi (a genre in Japan that contains sexual and/or romantic relations between two men); literally translates to "rotten boy"; corresponding female : fujoshi
May I have an order of regular degular buttermilk pancakes? Without all the added jazz? Hold the blueberry smiley face, strawberry glaze, chocolate chips and whipped cream.