Longman Dictionary of Contemporary English homepage

Date: 1900-2000
Origin: Probably from doodlysquat 'nothing' (1900-2000)

diddly

noun
     
did‧dly also did‧dly‧squat American English informal

not know/mean diddly

to know or mean nothing at all:
Brad? He doesn't know diddly about baseball.

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