A rating of how little of a life someone has. Used on Xbox. The higher your Gamerscore, the less of a life you have. (to a certain extent)
Lifeless Fag #1: Dude that guys gamerscore is 10,755!
Lifeless Fag #2: He must be teh 1337 badass!
Guy with Reasonably Gamerscore: No, you guys suck at life. Get outa your moms basement and get lives!
Lifeless Fag #1: HEY! ill kick you ass.....