When a girl goes all out with a obsession over a movie actor/actress, movie, fads, bands, etc.
A: OMFG OMFG! Twilight's on Jimmy Kimmel's tonight! I must watch them! OH! Have you seen my new Vampire dictionary and new edition of the Twilight Saga?! Rob Pattinson is going to my pale skinned/animal blood sucking lover! TWILIGHT, TWILIGHT, TWILIGHT!
B: Yeah... TFGD.... going a little too overboard..
B: TFGD(isorder), Typical fan girl disorder.