The unparalelled military leader of the Mongolians, dating back 800 something odd years. He conquered all of Asia, and plundered his beaten enemies. He left behind a vast treasure (probably more than the one in the movie "National Treasure"). From after his death to this day, his treasure hasn't been discovered.
Whether you believe it is up to you, but the man never lost a single battle. Something even Alexander the Great has faced before.
A ghengis-khan is when someone lightly grazes you in the nut sack, thereby creating the illusion that tyou're going to be ok, at least for a couple seconds before the intense pain kicks in and you black out.
Oh man, that sucked when I got ghengis-khan'ed last night.