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1.
A quantitative measure of the magnitude of a person's combined nerd qualities.

A measurement of just how nerdy a person really is.
"I don't know if I can bring myself to play World of Warcraft, it tests the limits of my nerditude."

"Inventing a new word to describe how nerdy people are is the mark of true nerditude."
by Bonomini August 26, 2007
 
2.
The degree of certainty pertaining to the speaker's knowledge of subjects that the listener really doesn't care about.
"I believe the Klingon for 'coward is 'p'tahk' , but I don't know that with absolute nerditude."

"Yeah, whatever"
by zetetic May 27, 2013