[SIZE=+2]pig out [/SIZE]
Definition: To eat large amounts of food quickly and without good manners; to overeat.
Example: 1) The pizza is here! Let's pig out!
2) At the game, we pigged out on hamburgers and french fries.
Etymology: Pigs are famous for enthusiastically eating enormous quantities of food. So when a human 'pigs out', he or she is eating much like a pig.