The fat that hangs out of a girl's vagina. The disadvantage to vag fat is when you pump in and out, it slaps you in the nuts. Other than that, it makes sex more enjoyable.
"That bitch's vagfat totally made wrecked my prostate."
refers to a skank or whore's vagina that has started sagging from a shit load of use.
person 1: Dude I can't wait to bang her
person 2: I wouldn't bang that! She's got vag-fat person 1: Ew. dude, screw that I'm gonna go bang your siter instead.
Fat Upper Vaginal Area for females, or FFA-Full Frontal Ass in males. When someone is so fat, it looks as if they have a beachball stuffed in the front of their pants. In actuality a Fat Vagina Or Fuva is a fat belly that one tucks into their pants.
Bill - "Did you see that fat chick?"
Steve - "Yeah, with that fat vagina hanging down!"