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Jyutping jan4 sai3 gwai2 daai6
Pinyin rén xì guǐ dà

Definitions (CC-CANTO)
  1. (slang) someone who is young but mature and astute / shrewd / savvy
Definitions (粵典–words.hk)
  1. 語句
    年紀​好細​但​詭計​、​鬼主意​多​。
    kids that always have wicked plans and play pranks on others
  2. 語句
    年紀​好細​但​做​啲​大人​先​做​嘅​行​為
    (lit.) small as a human and big as a ghost; (fig.) a child capable of thinking, acting and misbehaving like an adult; a child full of tricks
    • 佢人細鬼大,竟然用媽媽啲化妝品扮靚。
      佢人细鬼大,竟然用妈妈啲化妆品扮靓。
      keoi5 jan4 sai3 gwai2 daai6, ging2 jin4 jung6 maa4 maa1 di1 faa3 zong1 ban2 baan6 leng3.
      She acts as if she were an adult, using her mum's cosmetics to do make up.
  3. 參看
    人細詭大
Definitions (Kaifangcidian)
  1. 人小鬼大
  2. 人小點子多 – 人小点子多
Examples (粵典–words.hk)
  1. Cantonese
    佢人细鬼大,竟然用妈妈啲化妆品扮靓。
    佢人細鬼大,竟然用媽媽啲化妝品扮靚。
    keoi5 jan4 sai3 gwai2 daai6, ging2 jin4 jung6 maa4 maa1 di1 faa3 zong1 ban2 baan6 leng3.
    • She acts as if she were an adult, using her mum's cosmetics to do make up.