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Jyutping seoi2 pei4
Pinyin shuǐ pí

Definitions (CC-CANTO)
  1. (slang) referring to someone's skills and quality is poor, bad, inferior or deficient
Definitions (粵典–words.hk)
  1. 形容詞
    水準​低​於​正常​嘅​水平
    (of people) poor, weak, mediocre
    • 乜你咁水皮㗎?啲數咁易都唔識計!
      乜你咁水皮㗎?啲数咁易都唔识计!
      mat1 nei5 gam3 seoi2 pei4 gaa3? di1 sou3 gam3 ji6 dou1 m4 sik1 gai3!
      How come you're so poor at doing this? These sums are so easy but you still can't work them out.
  2. 近義詞
    差、廢、渣、渣斗、渣皮
Definitions (Wiktionary)
  1. noun, colloquial
    water surface
    (syn.) 水面
  2. adj, Cantonese
    poor; no good; bad
Definitions (Kaifangcidian)
  1. 水平低
  2. 質量差 – 质量差
  3. 差勁 – 差劲
Examples (粵典–words.hk)
  1. Cantonese
    乜你咁水皮㗎?啲数咁易都唔识计!
    乜你咁水皮㗎?啲數咁易都唔識計!
    mat1 nei5 gam3 seoi2 pei4 gaa3? di1 sou3 gam3 ji6 dou1 m4 sik1 gai3!
    • How come you're so poor at doing this? These sums are so easy but you still can't work them out.
Examples (Wiktionary)
  1. Mandarin
    水皮
    水皮
    shuǐ pí
    • water surface