you sit in a circle and one and is over the other persons hand and the other hand is under the other pesons hand. then when you start you hit the other persons hand.

Down by the river near the hankey pank where the bullfrogs jump from bank, to bank, say E I O U, your momma stinks and so do you so ping pong ding dong your daddy smells like king kong, so up your nose and through your toes your daddys wearing panny-hose, so 1,2,3,4,5,6,7,8,9,10 (who ever hand gets hit on 10 is out)