What you see when you walk behind a fat chavette wearing a crop top and low slung jeans. Huge rolls of fat will ooze out from all sides; the roll that comes just above her thong is called backfat. It's disgusting, but these girls think they look so good.
Person #1: LOL at the look on the guy behind Mosh Girl's face!
Person #2: He's probably horrified at the sight of all that backfat!