fegf - Future Ex Girlfriend
A female, who is being courted by a male, but is not yet reached the status of 'girlfriend'.
The title assumes that the male has no intention of keeping the female as his life partner - thereby making her his future ex.
Guy 1: Hey, see that girl over there?
Guy 2: Yea?
Guy 3: She's my fegf
Guy 4: Mine too...