From the publisher website:
There are those who want to play, and those who want to WIN. The whiners who don't understand "power gaming" call these people "munchkins." But what do we care?
In this outrageous satire, an experienced munchkin gleefully reveals the tricks of the trade: everything from re-rolling an unfavorable result to bribing the GM. Learn how to get the most out of character design, and why it doesn't really matter what your character's personality is as long as you get to FWACKOOM! the NPCs and grab their stuff. Munchkin GMs get their own chapter, of course: how to control the players, bend the rules, and up that body count!
Remember: If it's only a game, why do we keep score?