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

Definitions (CC-CANTO)
  1. it is used to describe someone who is opinionated and self-righteous
Definitions (粵典–words.hk)
  1. 名詞
    不自量力​、​自視過​高​嘅​人​;​亦​用​嚟​批評​人要​反省​自己​嘅​水平
    used to put someone down for thinking too highly of themselves or do not know their place, i.e. "who does he think he is?".
    • 你當你乜嘢新絲蘿蔔皮?
      你当你乜嘢新丝萝卜皮?
      nei5 dong3 nei5 mat1 je5 san1 si1 lo4 baak6 pei4
      Who do you think you are?
  2. 參看
    新鮮蘿蔔皮、身屍蘿蔔皮
Definitions (Wiktionary)
  1. phrase, Cantonese, idiomatic
    someone who overestimates one's capabilities
    • 你乜嘢新丝萝卜皮呀?
      你乜嘢新丝萝卜皮呀?
      nei5 mat1 je5 san1 si1 lo4 baak6 pei4 aa3?
      Who do you think you are? (used to put down someone who is too arrogant)
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?