Doodly-squat Edit Meaning

1.

Of no significance, rank or importance. The word “doodle” was in wide slang usage throughout the 19th Century to mean a fool, a clueless soldier or a penis. The term was in wide use during the Great Depression and was joined by the updated version "diddly-shit" in the 1960s.

“My gal is red hot (Your gal ain't doodly-squat)”

-- from the oft-covered 1950s song "Red Hot"

See diddly, doodle, fool, nothing