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did·dly-squatalso did·dly·squat (dĭd′lē-skwŏt′)
A small or worthless amount.
informal (usually used with a negative) US and Canadian anything: that doesn't mean diddly-squat. Also: diddly or diddley
Slang. the least amount: not worth diddly.
[1960–65, Amer.; probably euphemistic shortening of diddlyshit]