eat up a storm or eat a storm
To eat a storm is like opening a food fight in a restaurant and winning. You eat everything, everyone, and everything else.
My sister ate a storm at the buffet and left nothing behind. Even the waiter was jealous.
During the family gathering, my uncle ate a storm and scared the kids with his loud chewing.
I ate a storm at the pizza place and left a tip in the form of a full pizza box.