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 1: SWEET! I WILL SO ACE THIS QUIZ!
Student 2: Someone just had a braingasm...
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 1: SWEET! I WILL SO ACE THIS QUIZ!
Student 2: Someone just had a braingasm...
by CCCCCCCuda October 11, 2011

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.
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.
It's hard to get a braingasm, man!
by dasel horr March 26, 2016

by newbiedoo December 23, 2008

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 !!
by Alphastarr October 03, 2013

This is an orgasm of the brain, when you want to "bust a nut" but not really, being overly happy when a straight friend helps you out.
Will helped me figure out that I didn't need to pay an HVAC guy 100 bucks for a tripped fuse when I thought my AC unit shit the bed, I had a Braingasm right there on the spot!
by Tiger6513 September 01, 2010
