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
Sam touches the ball and does not touch the wall in time
Bill shouts balls to the wall! Sam walks to the wall and covers his crotch while the other guys take turns trying to hit him. After thirty seconds Sam comes back into the game. This is balls to the wall.
When a man's penis becomes erect, he squeezes his balls to the closest wall and yells out "Oh sweet Jesus" "balls to the wall" can hurt and end up in painful surgery in a gynecolegists bedroom.
Geez Fred, when you took that 60 foot drop on your tri'cycle your balls actually stuck to the wall. U were balls to the wall erific!
Is a term used to describe doing something all-out, with maximum effort and not holding back.
"Holy shit Paddy you were really givin' er last night... You were balls to the wall. Fuck"
-Previous night Paddy was so wasted he took his Balls out of his pants and was rubbing them on the wall.