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12.
The combination of extreme pleasure and anxiety while watching an all-male band perform, and the realisation that you are attracted to them. Applicable in the context of heterosexual and/or homosexual desire, plus anything in between.
While watching Mangasm, Lincoln's finest band, i did indeed experience a Mangasm.

My girlfriend had a Mangasm while listening to The G-Spot Monks.

Dave couldn't control his Mangasm at the gig.
by Shane Gostelow January 16, 2007
 
1.
when a man, has an extreme rush of joy similar to an orgasm from something manly. Such as beer, spicy food, explosions, fast cars, firing big guns, hot chicks, or movies involving all of those things.
I had a mangasm watching Snakes on a Plane!

Hunting with the 50 caliber rifle is a complete mangasm!

When I floored my 69' Chevelle I had a mangasm!
by Austen the Puerto Rican September 20, 2006
 
2.
Noun. The reaction of a man to something manly an attractive such as cars, tools, or other man things. Usually can be identified by an abrupt stopping of speech, movement, or both and the utterance of "oh my god" or other exclamations under the breath. This is usually followed by still standing and staring, or a sudden change in direction to get a better look at the object in question.

Girls, are not included in this, or resembling girls, as this is just a normal orgasm.
"Yeah, so I just tell the guy look budd- holy sh*t..."

"Jim? Helloooo."

"Yeah, sorry, just had mangasm over that 1972 Nova."
by Fobia7teen July 02, 2009
 
3.
Getting really excited over something silly. Not always but usually suspect.
They're coming out with a My Little Pony Live Action Movie. I just had a man-gasm.
by BT aka Witten Mittens September 06, 2013
 
4.
Women orgasm...men mangasm!
It was beautiful. She orgasmed as he mangasmed.
by zuesapus32 June 09, 2011
 
5.
see "Camaro"
"have you seen the 2011 camaro SS?"

Ya bro! I mangasmed all over my mullet!
by z28n18 April 06, 2011
 
6.
the feeling when a man gets a orgasm, but from something manly like burritos, throwing shit like knives, shooting guns, watching the expendables, football, beer, etc.
i got a mangasm after watching the expandables
by ametz21 October 12, 2010
 
7.
1. getting an intense reaction due to manly things such as fast shit, guns, large amounts of cash, explosions, and other cool s**t.
2. Doing something manly while being pleasured by a women creating a double reaction of awsomness.
1. Lighting those large amounts of explosives may cause a mangam
2.While watching a war movie my girl gave me a BJ creating the ultimate mangasm.
by The manly genius December 13, 2010