Just for those who don’t know,

In gaming, a Munchkin is a player who plays what is intended to be a non-competitive game (usually a role-playing game) in an aggressively competitive manner. A munchkin seeks within the context of the game to amass the greatest power, score the most “kills,” and grab the most loot, no matter how deleterious their actions are to role-playing, the storyline, fairness, logic, or the other players’ fun. The term is used almost exclusively as a pejorative and frequently is used in reference to powergamers and to immature players in general.

:)