A nerd slang from the ninties, commonly referred to in video gaming, which is used to describe a move of uber pwnage used in rapid succession to defeat the opponent. Some video games (Rage) will sometimes show a symbol involving a piece of cheese with a cancellation symbol above it to indicate that a player is rapidly using the same move over and over and will drain their health total to even the balance of pwnage they have caused.
WTF Dalsim! Stop side sweeping me, you're abusing the cheese!