A person who plays every silly Xbox 360 game only to boost their gamerscore
Ben is such a gamerscore whore, he'd even play Kabuki Warriors to pump his gamerscore
Somebody who will do anything to get achievements of Xbox 360.
You: I have about 5000g
Them: Really? I have 30000g!
You: Well you're a bit of a Gamerscore Whore, aren't you?