did·dly

[did-lee]
noun, plural did·dlies for 2. Slang.
1.
a thing of little or no value; naught: Your excuses aren't worth diddly to me.
2.
a flaw; malfunction.

Origin:
perhaps euphemistic shortening of diddlyshit

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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WordNet
diddly

noun
a small worthless amount; "you don't know jack" 
WordNet® 3.0, © 2006 by Princeton University.
Cite This Source
00:10
Diddly is always a great word to know.
So is ninnyhammer. Does it mean:
a fool or simpleton; ninny.
a scrap or morsel of food left at a meal.
Example sentences
The breakthroughs get a lot of attention, but attention means diddly-squat in the bigger picture.
It's because the university tests that have shown diddly-squat.
D-Wave has demonstrated diddly squat that could not be simulated by a
  conventional computer.
Crouching to bunt doesn't change the strike zone, oh you who claim to know
  diddly about baseball.
Related Words
Slang
Synonym Game
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