1. A hard-on that only nerds get.

2. A rude name for a person/persons exhibiting nerd-like qualities in a manner that succeeds only in scaring normal people.
1. "That new Zelda game totally gave me a nerdon!"

2. "Good god! Why do you have to be such a friggen nerdon?!"
by EmyInYourMind March 16, 2011
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the act of being turning on by nerdy situations
The guys looked over his textbook and winked at me. What a nerdon!
by JAAC December 14, 2010
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