A sheet or a blanket tied across the bars of the front of the cell, blocking the cell from view.
It's the only form of privacy that prisoners can get in their cells, it's most commonly employed so that the inmates can have sex with each other without an audience. Even guards respect the sheet though it's against the rules.
The prisoner tied the blanket in knots around the bars of their open cell so it acted like a curtain blocking them from view, the universal prison sign for “we’re fucking in here”. It was what they called the prison sheet.
by crimzonchyld November 23, 2013
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