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Jyutping jat1 si4 hau2 faai3
Pinyin yī shí kǒu kuài

Definitions (CC-CANTO)
  1. one who said something not meant to be spoken; one who slipped with one's words
Definitions (粵典–words.hk)
  1. 動詞、俚語
    講​嘢​講得​太快​,​搞​到​好容易​講錯​嘢
    to speak too quickly, i.e. to say the wrong thing
    • 我一時口快講咗啲唔應該講嘅嘢。
      我一时口快讲咗啲唔应该讲嘅嘢。
      ngo5 jat1 si4 hau2 faai3 gong2 zo2 di1 m4 jing3 goi1 gong2 ge3 je5.
      I spoke too fast that I have said something I shouldn't.
Examples (粵典–words.hk)
  1. Cantonese
    我一时口快,言语上有得罪嘅地方,请原谅。
    我一時口快,言語上有得罪嘅地方,請原諒。
    ngo5 jat1 si4 hau2 faai3, jin4 jyu5 soeng6 jau5 dak1 zeoi6 ge3 dei6 fong1, cing2 jyun4 loeng6.
    • Please pardon my bluntness. I spoke without thinking.
  2. Cantonese
    我一时口快讲咗啲唔应该讲嘅嘢。
    我一時口快講咗啲唔應該講嘅嘢。
    ngo5 jat1 si4 hau2 faai3 gong2 zo2 di1 m4 jing3 goi1 gong2 ge3 je5.
    • I spoke too fast that I have said something I shouldn't.