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Jyutping lau4 seoi2 hong2 wan4
Pinyin liú shuǐ xíng yún

Definitions (Wiktionary)
  1. phrase, idiomatic, of calligraphy, usually
    very smooth and natural; natural and unforced style

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Jyutping lau4 seoi2 hang4 wan4
Pinyin liú shuǐ xíng yún

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
    行雲流水