Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
diddly-squat is a noun meaning "a small worthless amount". It carries one recorded sense.
a small worthless amount
“you don't know jack”
Definitions, synonyms and semantic relations for diddly-squat come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.