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Jyutping mat1 je5 san1 si1 lo4 baak6 pei5
Pinyin miē yě xīn sī luó bo pí

Definitions (粵典–words.hk)
  1. 語句、俚語
    話​人​自視過​高​,​睇​得​自己​太​重要​或者​當​自己​係​咩​大人物​嘅​時​候​用
    an expression used to give someone a dressing-down for his arrogance, "who does he think he is?"; literally: what kind of new silk turnip skin
    • 踩上門仲要串串貢咁款,你當你乜嘢新絲蘿蔔皮呀?
      踩上门仲要串串贡咁款,你当你乜嘢新丝萝卜皮呀?
      With all that arrogance on our turf, just who do you think you are?

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Jyutping mat1 je5 san1 si1 lo4 baak6 pei4
Pinyin miē1ye xīn sī luó bo pí

Definitions (CC-CANTO)
  1. who the heck?; who's so special / important? (in a sarcastic tone); who does he / she think he / she is; who do you think you are [colloquial]
Examples (粵典–words.hk)
  1. Cantonese
    你当你乜嘢新丝萝卜皮?
    你當你乜嘢新絲蘿蔔皮?
    nei5 dong3 nei5 mat1 je5 san1 si1 lo4 baak6 pei4
    • Who do you think you are?
  2. Cantonese
    踩上门仲要串串贡咁款,你当你乜嘢新丝萝卜皮呀?
    踩上門仲要串串貢咁款,你當你乜嘢新絲蘿蔔皮呀?
    • With all that arrogance on our turf, just who do you think you are?