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1. n. Jack Daniels whiskey. (Initialism. Jack Daniels is a protected trade name for a brand of whiskey.) He poured a little JD into a glass, set it aside, and drank all of what was in the bottle.
2. n. a young kid; a young male; a juvenile delinquent. (Colloquial when used as an exaggeration.) The JDs are taking over the neighborhood.
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.