Actually spelled "rochambeau".
Similar to RockPaperScissors, except more painful.
Each player kicks the opponent as hard as possible in the genital region. The first person to fall down is the loser.
Player 1: "Hey, I'll rowshambo/rochambeau you for the first slice of pizza!" XD XD
Player 2: "OKAY~!!" ^_^ ^_^
Player 1: "Me first!" *evil grin*
*swift kick to groin of Player 2 by Player 1*
*Player 2 falls over in immense pain, Player 1 laughs and eats pizza.*