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1.
the feeling of complete happiness/understanding one gets from any number of things. Such things include listening to a mindblowing guitar riff, or seeing a person you hate get screwed, among countless other things.
After listening to Hysteria, I can hardly think due to the intense mindgasm it brought me to.

After hearing Kristin got fired, I laughed for two straight minutes and smiled for the rest of the week. It was purely mindgasmic.
by Jake Seifert March 11, 2006
 
2.
1. A brief but intense pleasure experienced during mental arousal.

2. A thrilling point of intensity of emotional excitement.

Steve’s writing gives me mindgasms.

Mindgasms are good.
by ash lemon February 19, 2006
 
3.
It is when your mind is so stimulated, (usually by visual pleasures) that you begin to 'freak out'...have a mindgasm
All of the pretty colors and insane out-of-this-world music caused a mindgasm
by dreamer8402 April 08, 2009
 
4.
A metaphorical orgasm that happens after a mind has been blown.
After finally discovering the truth, Timmy had his mind blown, and then had a mindgasm.
by rcohen118 November 09, 2010
 
5.
A feeling so incredible it cannot be described in any other wording.
"Dude these chicken tenders are giving me a mindgasm."

"That painting is simply mindgasmic."
by djniosdfo October 02, 2011
 
6.
1. A brief but intense pleasure experienced during mental arousal.

2. A thrilling point of intensity of emotional excitement.

Steve’s writing gives me mindgasms.

Mindgasms are good.
by ashlemon February 20, 2006
 
7.
When a male is having great sex but is unable to erupt through penile explosion, however he still feels the same intensity of an orgasm. Sometimes called a Braingasm.
George was on some medication that greatly delayed his splooge factor. His girlfriend didn't mind because he could last a long time and he could have mindgasms that brought them both off.
by George Humpsalot March 11, 2009