In modern
day United States, Roshambo or Rochambeau is when two or more guys kick, punch, squeeze, or knee each other in the groin to win something (an object, money, bets, etc..) untill one of them gives up or falls down. The last
one standing wins. This is a modern American twist on the
game.
It is also a very old word of Egyptian origin for the
child game "Paper, Sissors,
Rock".
In the TV series South Park, Cartman and his friends play the game "I'll Rochambeau you for it", by kicking the opponent in the crotch. The first
one to fall over loses the game. This of course means the first person to go is usually the winner. This is a way of choosing, and it's called Rochambeau.