A literal sexual arousal induced by esoteric hobbies not appreciated by a reality loving populus.
Yo krazy karl gets a nerdrection whenever he watches starwars.
by Phenomally December 07, 2006
When a nerd becomes extremely excited by something nerdy

Orgin: Colbert Report 2006
Tom had a nerdrection when he found out the release date for Spore.
by Claw December 06, 2006
When a nerd experiences or anticipates a certain event that is expected to have a positive effect, she or he receives a certain swelling in her or his nether region.
When members of my cast heard you were coming on my show, they received a nerdrection.
by Nicholas A B December 04, 2006

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