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Jyutping aa3 sing4
Pinyin ā chéng

Definitions (Wiktionary)
  1. noun, Malaysia-Hokkien, Singapore, derogatory, slang
    A young ethnic Chinese man, associated with a stereotype of having little education or sophistication and operating within secret societies and street gangs.
    (syn.) 阿明, 阿莲, 阿花, 阿蓮
Examples (粵典–words.hk)
  1. Cantonese
    我喺旺角巧遇阿成。
    我喺旺角巧遇阿成。
    ngo5 hai2 wong6 gok3 haau2 jyu6 aa3 sing4.
    • I bumped into Ar Shing at Mong Kok.