信你一成，雙目失明 [－－－－－双－－－]

Jyutping seon3 nei5 jat1 sing4 ， soeng1 muk6 sat1 ming4
Pinyin xìn nǐ yì chéng ， shuāng mù shī míng

Definitions (Wiktionary)
  1. phrase, Cantonese, idiomatic
    Used to express that someone is not believable
Examples (粵典–words.hk)
  1. Cantonese
    信你一成，双目失明。
    信你一成，雙目失明。
    seon3 nei5 jat1 sing4, soeng1 muk6 sat1 ming4.
    • Anyone who trusts you as much as 10 percent is blind.