Rollin Fat

To be completely on top of your game.

Dude 1: "Sup bro, I just arrived and I've got a piece for both of us."
Dude 2: "Oh shit, your rollin fat!"

ROLLIN IN FAT STACKS

Doing so well financially that you literally cannot even. Having an inflated disposable income.

I started at the bottom and now I am rollin in fat stacks.