Eating extra food when you don't know how long it will be until your next meal. Eating a lot to keep yourself from getting hungry later.

A stupid person; it refers to the lack of surface area on an individual's brain. The general thought is that the more surface area (wrinkles, creases, etc.) a brain has, the smarter the person is. Conversely, a person with a smooth brain (no wrinkles) has less surface area and would therefore be stupid.

to do exceptionally well or to have great success.
to show someone up or simply accomplish a task well.

A synonym for pwn or beast, referring to video games. To kick someone's ass while playing a video game, usually fighting games (Ex: COD)

To start putting on a weight usually a gut.

One might also refer to someone's gut or give said individual the nickname lunch man