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Jyutping sei2 zai2 gon1
Pinyin sǐ zǎi gàn

Definitions (粵典–words.hk)
  1. 名詞
    用​嚟​來​鬧​啲​瘦弱​嘅​後​生仔
    used to curse a thin, weak, young man
Definitions (Wiktionary)
  1. noun, Cantonese
    bad guy; bad boy
    (syn.) 壞小子, 死仔包, 坏小子

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Jyutping sei2 zai2 gon1
Pinyin sǐ zǐ gān

Definitions (CC-CANTO)
  1. bad boy (spoken)