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Jyutping fung1 maa5 ngau4 bat1 soeng1 kap6
Pinyin fēng mǎ niú bù xiāng jí

Definitions (CC-CEDICT)
  1. to be completely unrelated to one another (idiom)
  2. irrelevant
Definitions (粵典–words.hk)
  1. 語句
    互相​完全​冇​任何​關聯
    to be totally unrelated; having absolutely no connection with one another
    • 我點會同佢有路呀?我同佢都風馬牛不相及嘅!
      我点会同佢有路呀?我同佢都风马牛不相及嘅!
      How is it possible for us to have an affair. I do not have any connection with him at all!
  2. 近義詞
    牛頭唔搭馬嘴
Definitions (Wiktionary)
  1. phrase, idiomatic, of things
    to have no relationship with each other whatsoever; to be totally irrelevant; apples and oranges
Definitions (Kaifangcidian)
  1. (沒有對應漢語詞彙)
Examples (粵典–words.hk)
  1. Cantonese
    我点会同佢有路呀?我同佢都风马牛不相及嘅!
    我點會同佢有路呀?我同佢都風馬牛不相及嘅!
    • How is it possible for us to have an affair. I do not have any connection with him at all!
Examples (Wiktionary)
  1. Mandarin
    风马牛不相及
    風馬牛不相及
    fēng mǎ niú bù xiàng jí
    • irrelevant