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A louse, especially of the pubic region. Often used in the plural. Don't sleep with him—he seems like the type of guy you'd catch crotch-monkeys from, gross.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.