A wordplay on the term "uber pwnage," pronounced New-burr-Pone-edge, n00ber pwnage has two definitions.
1. beginners luck; when a n00b is doing well in a video game (must be against other people; ie. XBox Live, a PC game, etc)
2. the art of targeting n00bs and n00bs alone.
Johnny: Yes! Killing spree!
Paul: Dammit! Freaking n00ber pwnage..
Timmy: Boom! Headshot! Boom! Headshot!
Jimmy: Nice! *high fives Timmy* That's some n00ber pwnage, Timmy!