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Jyutping sei3 maan6 gam2 hau2
Pinyin sì wàn hán kǒu

Definitions (粵典–words.hk)
  1. 語句
    笑​得​把​口​好似​麻雀​嘅​「​四萬​」​牌​中​嘅​四​字​噉
    used to describe a broadly smiling face, or someone who is always smiling and cheerful
    • 你中咗六合彩呀?笑到四萬咁口。
      你中咗六合彩呀?笑到四万咁口。
      nei5 zung3 zo2 luk6 hap6 coi2 aa4? siu3 dou3 sei3 maan6 gam2 hau2.
      Did you win the Mark Six? You are smiling very broadly.
  2. 參看
    四萬噉口

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Jyutping sei3 maan6 gam2 hau2
Pinyin sì wàn gān kǒu

Definitions (CC-CANTO)
  1. to wear a big smile [colloquial]
Examples (粵典–words.hk)
  1. Cantonese
    你中咗六合彩呀?笑到四万咁口。
    你中咗六合彩呀?笑到四萬咁口。
    nei5 zung3 zo2 luk6 hap6 coi2 aa4? siu3 dou3 sei3 maan6 gam2 hau2.
    • Did you win the Mark Six? You are smiling very broadly.