Usually referring to a rather large butt
Look at her butt!! That joint fat
David: I was with Joe yesterday
Ian: Who's Joe?
David: JOE MAMA SO FAT SHE TAKES UP 1% OF THE US TERITORY
Somebody or something that is cool awesome."That ride is really FAT!!Hit the hydros!!",Hey Girl that hairdo you got done looks FAT!!"(ref: 80's talk)
fat