Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
get-go is a noun meaning "the time at which something is supposed to begin". It carries one recorded sense.
the time at which something is supposed to begin
“they got an early start”
“she knew from the get-go that he was the man for her”
Definitions, synonyms and semantic relations for get-go come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.