Pig Out means to eat a lot of food, usually in a greedy or excessive way.
Examples:
1. After working all day, I decided to pig out on my favorite fast food: I ordered a double cheeseburger, large fries, and a milkshake. I couldn't resist!
2. Whenever I'm feeling down, I indulge myself by pigging out on chocolate. Yesterday, I ate a whole bar and felt much better afterwards.
