When you just can't stop eating.*
You're on a roll.
Growing rounder until you will roll.
From stuffing yourself with too many rolls.
So that you can't even fit into your fancy car, a Rolls.**
And your stomach is upset and you need relief, spelled starting with the letters "Rol"...
* It's called being an American.
** You probably can't afford a Rolls.
You bought too many rolls.
But at least you can roll everywhere.
You're all set.