(adj.) describes a young person or a child who behaves and thinks in a mature way; a young but worldly person
Definitions (粵典–words.hk)
形容詞
(貶義)形容細路仔未大個已經過份老成、世故、老練 (derogatory) to describe a child who is too mature, worldly, or experienced
佢細個嗰陣好老積㗎,成日學啲大人語氣講嘢。
佢细个𠮶阵好老积㗎,成日学啲大人语气讲嘢。
keoi5 sai3 go3 go2 zan6 hou2 lou5 zik1 gaa3, seng4 jat6 hok6 di1 daai6 jan4 jyu5 hei3 gong2 je5 He was too mature in his youth, and would always mimic an adult's way of speaking.