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Jyutping sei3 maan6 gam2 hau2
Pinyin sì wàn dàn 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
    四萬咁口
Definitions (Wiktionary)
  1. phrase, Cantonese, idiomatic
    describes a broadly smiling face
    • 笑到四万噉口
      笑到四万噉口
      siu3 dou3 sei3 maan6 gam2 hau2
      to be smiling very broadly
Examples (粵典–words.hk)
  1. Cantonese
    四万噉口
    四萬噉口
    sei2 maan6 gam2 hau2
    • used to describe a broadly smiling face