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Jyutping jat1 tau4 mou6 seoi2
Pinyin yī tóu wù shuǐ

Definitions (CC-CEDICT)
  1. to be confused
  2. to be baffled
Definitions (粵典–words.hk)
  1. 語句
    迷惑​;​困惑​;​理解​唔​到
    (lit.) a head in mist; (fig.) to be puzzled; to fail to understand
    • 佢講嘢唔清唔楚,聽到大家一頭霧水。
      佢讲嘢唔清唔楚,听到大家一头雾水。
      keoi5 gong2 je5 m4 cing1 m4 co2, teng1 dou3 daai6 gaa1 jat1 tau4 mou6 seoi2.
      He was so unclear that no one could understand what he was trying to say.
Definitions (Wiktionary)
  1. phrase, idiomatic
    to be completely muddle-headed; to be baffled
Definitions (Kaifangcidian)
  1. 滿頭霧水 – 满头雾水
  2. 莫名其妙
  3. 摸不著頭腦 – 摸不着头脑
  4. 困惑
  5. 糊塗 – 糊涂
Examples (粵典–words.hk)
  1. Cantonese
    佢讲嘢唔清唔楚,听到大家一头雾水。
    佢講嘢唔清唔楚,聽到大家一頭霧水。
    keoi5 gong2 je5 m4 cing1 m4 co2, teng1 dou3 daai6 gaa1 jat1 tau4 mou6 seoi2.
    • He was so unclear that no one could understand what he was trying to say.
  2. Cantonese
    望住佢一头雾水个样,笑死我啦!
    望住佢一頭霧水個樣,笑死我啦!
    • When I was looked at his confused face, I couldn't stop laughing.