It's literally an abrasive term used to insult basically anyone who isn't a fan of Gaga for whatever reason. If posters called each other any other names similar to it, it would be an automatic WP.
I mean, it's just an abbreviated phrase, why do you care so much??
I think it's sort of funny sometimes, most of the time I don't even notice people saying it.
It's a light-hearted joke that the Gaga stans use, but if it bothers you that much then maybe you shouldn't be on ATRL. xo