The practice of keeping extremely quiet during sexual activity (either with a partner or alone), particularly during orgasm, due to the close proximity of one's roommate(s).
Because my roommatesin the room next door were in, I had to keep the volume at dormgasm-level so as not to disturb them with my hot sex.
outside of porno and hentai, it's the closest thing to a true orgasm geeks, nerds, etc will experience, occuring when they are exposed to information or ideas pertaining to their favorite subjects (includes games, anime, etc...)
(Example of a partner-induced dorkgasm)
Geek: Pixar should join up with Studio Ghibli!
Nerd: ...Ooh!
Geek: Dude, what was that?
Nerd: I just got a... dorkgasm!
(Example of a self-induced dorkgasm)
Loser: I love Trigun and I want to make a Warcraft III map out of it.
Examples of information-induced dorkgasms can be found at places like worldofwar.net and rpgamer.com
Noun. An orgasm over something exceptionally and unequivocally nerdy, including but not limited to:
a.) graphing an interesting function on your graphing calculator.
b.) Laughing too heartily at a chemistry joke.
c.) Getting a discrete mathematics problem correct on the first try.