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1.
Someone who is such a noob they misspell "Newbie".
Poopfeast - Sorry guys, I'm a Nerbie

Feastofpoop - Wow, what a nerb.
by Alex2the3gr8 April 30, 2012
 
2.
A nerd that is a noob at the same time.
Nerbie #1: Hey! I got 99.314159 on that test today!

Kid: What a nerbie. -.-
by Kenny S April 12, 2008