Big Back

An adjective that is used to describe someone who is fat or obese and eats a lot, and doesn't share. This word is usually used as an insult when your friend is acting fat and not sharing is actually fat.

Rachel: Hey Mikey can I have one oreo from your bag
Mikey: No bro, they're all mine, you better not touch any of them
Rachel: It's giving fat and big back, like you don't need all of that