When you find out some unknown piece of information, and you feel a rush of Intellectual glee. Related to intellectual masturbation, and Brain Jizzing
When Brian read the theory on equilibrium, he had a Braingasm
by Seth-The-All-Powerfull May 6, 2010
An orgasm of the brain, something that would be the equivalent of information sex, something that would make a nerd smile in a kind of creepy, happy way.
Nerd 1: Dude, we just got our new Calculus books!

Nerd 2: Alright! Braingasm!

Nerd 1: Yeah, we're so cool
by T pizzane March 26, 2009
The sudden, and often timely, understanding of a subject, usually in school. Most commonly paired with a loud exclamation of "OHHHHHHHHHHH! I GET IT NOW!" or something very similar. Usually done by the less studious members of the class, who understand it right before a test or quiz.
Teacher: So if you want to make x=2, you can. Just plug in 0 for y.
Student 1: OHHH! OH! OH! I GET IT NOW! So you just have to ...?
Teacher: Yes, Michelle, that's it. I've explained it for 3 weeks now."
Student 2: Someone just had a braingasm...
by CCCCCCCuda May 27, 2011
A sudden rush of short-lived intellect, intelligence, or insight on a matter or idea.
He thought about the girl and had a braingasm of poetry.
by newbiedoo December 24, 2008
It is a type of orgasm acheived from mind. Sexual arousal is physical and mental—but if one tries hard enough, our thoughts really are all we need to get off.
Some people can actually ‘think’ themselves off through fantasy and breath work.
These are sometimes called “energy orgasms,” because the method requires developed brains. Orgasms from “thinking off” show up in the same spot of the brain as orgasms from genital contact.
by dasel horr December 16, 2015
When your brain finally figures out something that was on the tip of your tongue (i.e. an eighties song or the name of a movie, etc.) and you end up yelling it at a random moment after the fact that is at a point of time that has nothing to do with the thing that you remembered !!
("OH My GOD !!!, Just had a Braingasm!!!!!!")
by Alphastarr October 3, 2013
n. An intense rush of intellectual fervor or excitement in response to a stimulus such as recognizing a literary allusion in "The Simpsons" or finally understanding how to do that advanced calculus problem or even just anything really cool. Usually accompanied by inability to formulate actual words and an intense enthusiasm about the subject that induced the braingasm.
That geek had the biggest braingasm after she saw LotR:RotK.
by Keri January 28, 2004