Something that happens when someone is being beaten by double their score or more. Originated in Modern Warfare 2: Free-For-All. The person that did this is now allowed to brag about it and make fun of the person and the other guy can't say anything because everyone knows he sucks at the game.
Joe: "Dude! I totally uber-pwned this one guy!"
Ben: "Really? What was the score?"
Joe: "I got 1500 and the other guy got 750."
Ben: "Dude I just got uber-pwned. The guy got 1500 and I only got 400."
Joe: "Wow you must really suck."