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Jyutping se4 zing1 beng6
Pinyin shé jīng bìng

Definitions (Wiktionary)
  1. noun, humorous, neologism, slang
    mad person

蛇精病 [---]

Jyutping
Pinyin shé jīng bìng

Definitions (CC-CEDICT)
  1. (slang) (pun on 神經病|神经病[shen2 jing1 bing4]) crazy person
  2. nutjob