A video game player who looks upon other players screens, whether on split screen or system link, to gain an unfair advantage by knowing what the other player is doing and where he/she is located.
I was a screen-whore when I looked on my friends screen to beat my friend on a head to head match in Halo 2.
A person who uses the God-like sword abilities in Halo 2 to obliterate all who seek to kill him/her. This person is usually known to be highly skilled with the sword and everybody becomes angered when they figure out that he/she has it. This person tends to keep the sword for the majority of the game.
Everybody gets mad when John plays Halo 2. He is such a sword bitch.