Gamerscore 

A points system used on the Xbox 360. Often abbreviated as just 'G'. Every Xbox 360 game has "achievements" and when you unlock these achievements you will get a certain amount of gamerscore.
For example, one achievement on Gears of War is called "Commando" and you unlock this when you complete the game on the hardest difficulty. It is worth 30G.
Your Gamerscore is shown on your Gamercard.

"Wow look at that guy with no life - he's got 100,000G!!"

"What a loser - he's boosting on games just for the Gamerscore!"

Gamerscore by GOWking January 6, 2008

Gamewhore 

Somebody who wants/owns all 3 major game systems; Xbox 360, PS3, and Wii. Also used to as a term to describe somebody who will do anything to get a game they want.

Kyle: Wade owns a Wii and a 360 but he wants a PS3.

Spencer: What a Gamewhore

Gamewhore by sl21wl22 November 30, 2010

Gamerscore 

Gamerscore is a way of measuring a gamer’s progress of games on the Xbox 360. Games award you with various achievements for completing certain tasks (i.e. kill 10 enemy’s in 10 seconds gives you 50 gamerscore).

You will always be made fun of for your gamerscore, either for being real low or real high. This is how many people see a person’s gamerscore:

0 – 1000: Really low, why do you even own an Xbox? Your a noob.
1000 – 2500: Low, there is more to play than Halo and GTA dude. Still a noob.
2500 – 5000: Below Average, Red Ring of Death strikes here. Emerging from noobness.
5000 – 7500: Average, you’re a gamer but you don’t run it completely into the ground. Your no longer a noob.
7500 – 10000: High, and Impressive.
10000 – 15000: Quite High, at this point you may start being called a ‘nerd’.
15000 – 20000: Damn Son, at this point you are a nerd.
20000 – 30000: Holy Fuck, its called outdoors, you know with trees and animals…
30000 – 50000: No Life, you live in your parents basement, no job, no girlfriend, ect.
50K and Up: Virgin, you have never seen a pussy, and at this rate you never will.

I saw someone on Xbox Live who had a gamerscore of 110,000, and couldn't believe that someone could possibly have that much spare time.

Gamerscore by Dewit October 5, 2009

Gamerscore Whore 

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?
Them: Yes

Gamerscore Whore by Waffleman1212 July 15, 2009

gamerscore points 

the points you recieve from doing challenges and objectives on xbox 360 games. many sad individuals spend their lives getting these.

'Hwohhh Gamerscore points'

*smug noise* 'states how much gamerscore points they have'

'this game is really generous on gamerscore points.'

gamerscore points by Davey Daix May 27, 2009

Gamerscore 

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 132,755!
Lifeless Fag #2: He must be teh 1337 b@d@$$!
Guy with Reasonable Gamerscore: No, you guys suck at life. Get outa your moms basement and get lives!
Lifeless Fag #1: HEY! ill kick you ass.....

Gamerscore by Chilanto' January 12, 2009

Gamerscore 

A meaningless number used by xbox 360 gamers to measure their epeen.

Achievement Whore: Haha! I have 95,600 gamerscore.
Normal Person: Congratulations! I have a life.

Gamerscore by Vicious Pancake February 15, 2010