slang A condom. A: "Hey, Tom—this chick wants to bring me back to her place!" B: "Go for it, dude. Just make sure you wear a jimmy cap!" I always keep a box of jimmy caps in my bedside table—just in case.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
n. a condom. (see also jimmy.) You better get a jimmy cap on that.
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.