Eats like a duck
When you eat so fast your mouth looks like it's about to explode, and you're just trying to get the food in before it can talk back.
My dad ate his steak like a duck. He didn’t even wait for the sauce.
At the diner, my friend ate like a duck and dropped a fry on the floor.
My sister said, 'You eat like a duck, you'll get a duck's face.'