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Jyutping ngong6 kau1 kau1
Pinyin gàng jiū jiū

Definitions (Wiktionary)
  1. adj, Cantonese, vulgar
    stupid; dumbass
    (syn.) 戆鸠, 戇鳩

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Jyutping ngong6 gau1 gau1
Pinyin gàng jiū jiū

Definitions (粵典–words.hk)
  1. 形容詞、粗俗
    語氣​強過​戇​鳩​,​同​戇​鳩​意思​一樣
    fucking stupid
    • 佢都戇鳩鳩。
      佢都戆鸠鸠。
      keoi5 dou1 ngong6 gau1 gau1.
      He's so fucking stupid.
  2. 近義詞
    柒撚矇矇
  3. 參看
    on99

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Jyutping ngong6 gau1 gau1
Pinyin zhuàng jiū jiū

Definitions (CC-CANTO)
  1. dickhead; fucking dumbass; stupid prick [colloquial]
Examples (粵典–words.hk)
  1. Cantonese
    佢都戆鸠鸠。
    佢都戇鳩鳩。
    keoi5 dou1 ngong6 gau1 gau1.
    • He's so fucking stupid.