/doohd"lee skwot'/ , n. Slang.
a minimum amount or degree; the least bit (usually used in the negative): This coin collection isn't worth doodly-squat in today's market.
Also, diddly-squat .
[ prob. euphemistic var. of DOODLY-SHIT, DIDDLYSHIT; see DOODLE 1 , DIDDLE 2 , -Y 2 ]