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.
mangasm: when a man reaches sexual climax with another male. usualy this consits of lound womenly type yelps or sreaming, most of the time this occurs after anal sez or exchanging blowjobs. on occasion a shit piss on his face will enduce the mangasm