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Jyutping haang4 wan4 lau4 seoi2
Pinyin xíng yún liú shuǐ

Definitions (粵典–words.hk)
  1. 形容詞
    飄​動​嘅​浮​雲​,​流​動​嘅​水​;​形容​飄灑​自然​,​無拘​無​束​嘅​樣
    (of writing or music) natural and smooth
    • 佢表演嘅呢套功夫,行雲流水,非常自然。
      佢表演嘅呢套功夫,行云流水,非常自然。
      keoi5 biu2 jin2 ge3 ni1 tou3 gung1 fu1, hang4 wan4 lau4 seoi2, fei1 soeng4 zi6 jin4.
      His performance of martial arts is very natural and smooth.
  2. 參看
    流水行雲

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Jyutping hang4 wan4 lau4 seoi2
Pinyin xíng yún liú shuǐ

Definitions (CC-CEDICT)
  1. lit. moving clouds and flowing water (idiom)
  2. fig. very natural and flowing style of calligraphy, writing, etc
  3. natural and unforced
Definitions (Wiktionary)
  1. phrase, idiomatic, of calligraphy, usually
    very smooth and natural; natural and unforced style
    (syn.) 流水行云, 流水行雲
Examples (粵典–words.hk)
  1. Cantonese
    佢表演嘅呢套功夫,行云流水,非常自然。
    佢表演嘅呢套功夫,行雲流水,非常自然。
    keoi5 biu2 jin2 ge3 ni1 tou3 gung1 fu1, hang4 wan4 lau4 seoi2, fei1 soeng4 zi6 jin4.
    • His performance of martial arts is very natural and smooth.