Definition of diddly-squat

< diddly

dideoxyinosine >

did·dly-squat also did·dly·squat    (ddl-skwt) KEY 

NOUN:
Slang

A small or worthless amount.

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ETYMOLOGY:
Alteration of diddlyshit (influenced by doodly-squat) : diddly (probably from diddle²) + shit, added as an intensive (from shit)