Top definition
The accumulated Gamerscore on a persons Xbox Live account, which is increased by getting Achievements in games. Most Achievements are easy to get, while some require frequent, if not constant gameplay.

A low number indicates that one is a casual gamer, while a high number is an indication of ones real nerdiness.
Andrew: Wow, did you see that guys Nerd Number, it was in the thirty thousands!

Thomas: He must not get a lot of sun.
by smarch111111 November 15, 2008
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