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A generic, and very vague way to answer a question with a great lack of enthusiasm. Commonly used after one has completed a task and is devastatingly bored, hence currently doing absolutely nothing or diddly shit.
Slim Johnson: "Hey Dick what have you been up to lately?"
Richard Head: "Well Slim... as of lately... diddly shit."
by Tight Chambers June 18, 2013
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When you sleep all day instead of getting anything productive done
Matt: hey what have you been doing today

Tom: I ain't done diddlyshit
by Sasquatchconfirmed July 29, 2016
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