To show someone up at something.
To brag consistantly about something you have done.
To walk around in a wife beater/shirt off.
To make yourself sound better with lies or false statements.
To belittle someone to make yourself feel better.
To fish for complements.
Mike: "Man I really want to learn how to backflip"
Dave: "Oh yeh? Well its super easy, I can do it in my sleep."