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Origin of "jack sh*t" - English Language & Usage Stack Exchange
JACK SHIT Definition & Meaning | Dictionary.com
I Don’t Know Jack Shit: Definition, Meaning, and Origin
Urban Dictionary: jack shit
JACK SHIT | What Does JACK SHIT Mean? - Cyber Definitions
JACK SHIT definition and meaning | Collins English Dictionary
jack shit - Wiktionary, the free dictionary
Jack-shit - Idioms by The Free Dictionary
jack shit noun - Definition, pictures, pronunciation and usage …
jack (shit) | meaning of jack (shit) in Longman Dictionary of ...