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Jyutping niu5 zi2
Pinyin niǎo zǎi

Definitions (Wiktionary)
  1. noun, Min-Nan, figuratively
    penis; male genitalia
  2. noun, Gan, Hainanese, Leizhou-Min, Min-Dong, Pingxiang
    little bird
  3. noun, dialectal
    bird