noun Slang.

probably euphemistic variant of diddlyshit

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World English Dictionary
diddly-squat (ˌdɪdlɪˈskwɒt)
informal (US), (Canadian) (usually used with a negative) anything: that doesn't mean diddly-squat

Collins English Dictionary - Complete & Unabridged 10th Edition
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Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Slang Dictionary

diddly-squat definition

[ˈdɪdliskwɑt] and [ˈdudliskwɑt]
and (doodly-)squat
  1. n.
    nothing. (Folksy. Originally black or southern.) : This contract isn't worth diddly-squat.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition.
Copyright 2007. Published by McGraw-Hill Education.
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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.
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