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diddlyshit

[did-lee-shit]
noun Slang: Vulgar.
  1. diddly(def 1).
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Origin of diddlyshit

probably earlier than 1960–65, Americanism; diddly (perhaps diddle2 + -y2) + shit
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018