To make a simple mistake, a schoolboy error. Taken from the terrificly silly act one can undertake if one fails to lift the lavatory seat whilst relieving one's bladder.
ORTON "Dufresne, if you want to indulge this fantasy, that's your business. Don't make it mine. This meeting's over."
ANDY "Look, if it's the squeeze, don't worry. I'd never say what goes on in here. I'd be just as indictable as you for laundering the money!"
NORTON "Don't you ever mention money to me again, you sorry son of a bitch! You've really pissed with the seat down now Dufresne. Solitary! For a cocking month!"
1. to hit someone in the family jewels (a.k.a. the seat, the junk, the baby maker, the twig and berries)
2. to hit someone in the balls as a form of punishment or torture.
1. When Jim wasn't looking I decided to give him a punch in the seat and he doubled over in pain.
2. The stupid sonofabitch wouldn't tell me where he hid the cash so I had Vinnie and Nunzio hold him down and I had to give him a punch in the seat a few times before he talked.