When someone your working with doesn't know anything
Well I thought John knew the area well, but he doesn't know diddley fuck.
by bethel100 January 20, 2017
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To do absolutely nothing of importance for a period of time.
"What have you been up to?"
"Who me? I've been up to sweet diddley fuck"
by Rex Breakfast January 14, 2016
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To do nothing. The word fuck at the end makes it worse than just doing jack diddley.
All my coworkers do all day is jack diddley fuck and I always have to clean up after the lazy bastards.
by jimmybomm April 21, 2022
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