The act created by a hero who will remain anonymous. This is the act of having sex with a woman from behind in the hallway after a long night of drinking; throwing up on her back and then finishing your business while she try's desperately to escape; once the deed is done you stand up, pull your pants up look her in the face and say "I'll call you" as you exit the room.
"Bro I hit Samantha with the Dirty Mangin."