did‧dly /ˈdɪdli/ (
also did‧dly‧squat /ˌdɪdliˈskwɒt $ ˈdɪdliskwɑːt/)
American English informal noun[
Date: 1900-2000;
Origin: Probably from doodlysquat 'nothing' (1900-2000)]
not know/mean diddly to know or mean nothing at all:
Brad? He doesn’t know diddly about baseball. [TahlilGaran] Dictionary of Contemporary English ▲