Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
happy-go-lucky is an adjective meaning "cheerfully irresponsible". It carries one recorded sense.
cheerfully irresponsible
“carefree with his money”
“freewheeling urban youths”
“had a harum-scarum youth”
Definitions, synonyms and semantic relations for happy-go-lucky come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.