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1.
Derives from the word orgasm.

When someone has experienced just too much nerdiness at one time, they are saidto have a nerdgasm. The person usually goes into a state of shock and can't speak for up to 1 hour. Never distured a someone who as recently nerdgasmed because the person is prone to just spurt out random nerdy things that regular people could never comprehend.
Person one: Dude, the PS3 is going to use blu-ray discs, imagine the texture file quality!!!

Person two:*nergasm*!!!
by Andrew Kuehler December 25, 2004
 
2.
When one experiences subsequent events of nerdiness, fandom, or geekiness that causes a sensory overload, loss of bodily functions, and a climax deep within the brain, in the section that recognizes specific information concerning comic books, occult television shows, video games, or electronics that only a specific section of the population would actually know about.
Oh my God! The secret scene at the end of Iron Man gave me a total nerdgasm!
by Zack T. May 09, 2008
 
3.
A nerd's sensory overload caused by the introduction of said nerd to the latest technology or fandom.
Nerd1: Hey, did you hear about ATI's new Radeon card? It blows my b0x0rs off!
Nerd2: Oooh that sounds sexy. *nerdgasm*
by Mr. Pants May 18, 2004
 
4.
the result of the excitement of one's nerdy or geeky tendencies. Usually when someone gets excited about some new game, technology or tech-device. Having a nerdgasm can sometimes result in fainting.
OMG! Half-Life 2 is gonna pwn! *NERDGASM* *FAINTS*
by Glutnix September 04, 2003
 
5.
silimlar to a joygasm, but this is when an orgasm is caused by some overly nerdly stimulant.
this year's Star Trek convention was a complete nerdgasm!!
by juice l. bee April 30, 2005
 
6.
A moment of intense orgasm-like excitement shared by two nerds over a topic they're both familiar with.
Jimmy had a nerdgasm when Denice mentioned the paradox of infinite sets.
by Foohtube November 05, 2010
 
7.
The term defining the serious over excitement and sometimes occasional heat flashes felt by nerds at high points in their lifes.
I.E. obtaining a top of the line graphics card may lead to a serious nerdgasm, as could very anticipated games.
by Patrick Barnhardt February 15, 2009