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Jyutping faat3 wan1 gai1
Pinyin fā wēn jī

Definitions (CC-CANTO)
  1. Chicken with sickness; gone nuts; gone mental; gone insane
Definitions (Kaifangcidian)
  1. 傻子
  2. 瘋子 – 疯子
  3. 神經病 – 神经病