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Jyutping faan1 hoeng1 haa2 zap1 ngau4 si2 laa1
Pinyin fǎn xiāng xià zhí niú shǐ la

Definitions (粵典–words.hk)
  1. 語句、俚語、粗俗
    用​嚟​侮辱​人​哋​冇​文化​,​做​嘢​冇​樣​掂​或者​出身​貧寒
    an insult to imply that someone is unsophisticated, incompetent, or with a low social standing; literally, to go back to home village and collect cow shit

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Jyutping faan1 hoeng1 haa2 zap1 ngau4 si2 laa1
Pinyin fān3xiang xià zhí niú shǐ la

Definitions (CC-CANTO)
  1. go back to where you came from, you yokel!