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Jyutping gau2 coi2
Pinyin jiǔ cǎi

Definitions (CC-CANTO)
  1. literally: nine colors; many colors [written and colloquial] seriously; extremely [colloquial]
Definitions (Wiktionary)
  1. adj, Cantonese
    Used with 到 for an intensifying effect, usually in a negative sense.
    (syn.) 七彩
    • 忙到九彩
      忙到九彩
      mong4 dou3 gau2 coi2
      to be extremely busy
Examples (粵典–words.hk)
  1. Cantonese
    呢排英镑跌到九彩呀。
    呢排英鎊跌到九彩呀。
    • Recently the British Pound has fallen down very sharply.
Examples (Wiktionary)
  1. Cantonese
    忙到九彩
    忙到九彩
    mong4 dou3 gau2 coi2
    • to be extremely busy