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Jyutping si6 gau2 daan6 daan6
Pinyin shì jiǔ dàn dàn

Definitions (粵典–words.hk)
  1. 語句
    粗口​講法​「​是​鳩​但​但​」​嘅​諧​音​;​即​係​是​但​;​隨便​;​冇​所謂
    euphemism for 是鳩但但(si6 gau1 daan6 daan6); ok; fine; whatever
  2. 參看
    是九但但、是狗彈彈、是九旦旦、事九但但

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Jyutping si6 gau1 daan6 daan6
Pinyin shì jiǔ dàn dàn

Definitions (CC-CANTO)
  1. what fucking ever [colloquial]