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dated slang A police officer assigned to patrol public bathrooms. Such officers became associated with the practice of monitoring for homosexual activity in places where such practices were illegal. "Crapper" is a slang term for the toilet, while "dick" is a slang term for a detective. A: "What's that cop doing here by the bathrooms?" B: "Oh, he must be a crapper dick."
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
n. a police officer or detective who patrols public toilets. When he flubbed up the Wilson case, they made him a crapper dick in the central business district.
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.