Definitions for jack shit
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Random House Webster's College Dictionary
jack′ shit`(n.)
jack (def. 13).
Category: Status (usage)
Origin of jack shit:
1965–70
Wiktionary
jack shit(Pronoun)
nothing, anything
Citation
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"jack shit." Definitions.net. STANDS4 LLC, 2013. Web. 24 May 2013. <http://www.definitions.net/definition/jack shit>.