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 analsez or exchanging blowjobs. on occasion a shit piss on his face will enduce the mangasm