eat like a pig
To eat large quantities of food and/or to eat sloppily. Kim is staying for dinner, and she eats like a pig, so you better make some extra food. Quit eating like a pig in this fancy restaurant—you're spilling stuff all over the tablecloth!
eat like a pig
INFORMALIf someone eats like a pig, they eat a lot of food, often in a greedy or unpleasant manner. He was the sort who could eat like a pig and never put on weight. They ate like pigs. I'd never seen anybody eat like this.