Often a player in a FPS or other games who is obsessed with their score. They believe that having the highest score signifies that they are the best player, and therefore should be worshipped accordingly.
"K89lemur is a real score whore, he thinks that just because he has the highest score, he's the best player, even though I killed him twice as many times as he killed me."
An Xbox 360 player who, due to his vane outlook concerning his gamertag, brings himself to play software not for enjoyment, but for the sole purpose of increasing gamerscore. Score whores often employ the use of unlimited rental plans and seldom buy the actual games to support the studios that develop said titles. Once a score whore achieves a desirable amount of achievements, you will never hear the end of it.
You: Dude TMNT is so much fun!
Me: No its not, you pathetic score whore.
You: You're just jealous.
Me: Get a life.