Origin of diddly-squatAlteration of diddlyshit (influenced by doodly-squat ) diddly (probably from diddle 2) shit
- Alternative form of diddly-squat.
- (US slang, often humorous) Nothing; nothing whatsoever.
The Random House Historical Dictionary of American Slang suggests that this is a variation of doodly-squat from 1934. Doodly-squat was originally the more common form, but diddly-squat overtook it in the mid-1970s, and is now four times more common in print.