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Jyutping gau2 si2 lou2
Pinyin gǒu shǐ lǎo

Definitions (粵典–words.hk)
  1. x

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Jyutping gau2 si2 lou2
Pinyin gǒu3shi lǎo

Definitions (CC-CANTO)
  1. bastard / shit head, a term of insult to describe someone who is unworthy or of low character [colloquial]