What is Backfat?
1.
What you see when you walk behind a fat
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!
See
2.
A fat person that has develope back rolls on there back.
"man when i put my bra on. my backfat started hanging from my straps"
See