straightening closet
n.— «Straightening closet: An officers’ term for a room—a supply room in a case related by one officer—where an inmate can be taken and assaulted, or “straightened out,” without witnesses.» —“What the lingo means” by Adam C. Smith, Jo Becker St. Petersburg Times (Florida) Dec. 30, 1999. (source: Double-Tongued Dictionary)