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Jyutping zan1 sam1 gaau1
Pinyin zhēn xīn jiāo

Definitions (粵典–words.hk)
  1. 名詞、潮語
    網絡​用語​。​指一個​人​被​諷刺​笑​話​或​假消息​欺騙​、​或​被​假扮​戇​鳩​嘅​人​呃​咗​,​走出​嚟​真心​指正​錯​誤​嘅​人​。
    one who does not understand sarcasm and replies seriously to jokes on internet forum
    • 假到咁都呃到你,你都算真心膠喇。
      假到咁都呃到你,你都算真心胶喇。
      gaa2 dou3 gam2 dou1 ngaak1 dou2 nei5, nei5 dou1 syun3 zan1 sam1 gaau1 laa3
      Even a joke fake as this can trick you, you really are a genuine idiot.
  2. 反義詞
    假膠
Examples (粵典–words.hk)
  1. Cantonese
    真心胶
    真心膠
    zan1 sam1 gaau1
    • a genuine dumb
    • someone who doesn't understand sarcasm
  2. Cantonese
    假到咁都呃到你,你都算真心胶喇。
    假到咁都呃到你,你都算真心膠喇。
    gaa2 dou3 gam2 dou1 ngaak1 dou2 nei5, nei5 dou1 syun3 zan1 sam1 gaau1 laa3
    • Even a joke fake as this can trick you, you really are a genuine idiot.