doodly-squat

[dood-lee-skwot] /ˈdud liˌskwɒt/
noun, Slang.
1.
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.
Origin
probably euphemistic variant of doodly-shit, diddlyshit; see doodle1, diddle2, -y2
Slang definitions & phrases for doodly-squat

doodly-squat

adjective

Penniless; broke (1930s+ Carnival)

noun

doodle-shit