1. One of the ways to get back in during a game of wall-ball.
If a player is knocked out he has to stand against the wall while the other players throw the ball at him. If it is an informal game played by friends the guy will have to stand there for either a specified period of time, or a specified number of shots. He will be allowed to cover his crotch with one or both hands. In serious games the crotch can not be covered and the guy has to stand there until the next person gets out.
2. The phrase you shout when someone gets out and you are playing with these rules