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rude slang Anything or any amount (of something) at all. Always used in negative constructions to express a complete and utter lack of something. Just shut up, Tom. You don't know jack shit about marketing. I spent a whole day in the library doing research, but I didn't find jack shit to use for my thesis.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
1. n. a stupid and worthless person. (Usually refers to a male. Usually objectionable.) What a jack-shit! Not a brain in his head!
2. n. anything; anything at all. (Always in a negative expression.) This whole thing isn’t worth jack-shit!
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.