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Jyutping dai6 ng5 zi1
Pinyin dì wǔ zhī

Definitions (CC-CANTO)
  1. (noun) penis
Definitions (粵典–words.hk)
  1. 名詞、粗俗
    指​男性​性器官​(​因為​係​四肢​以外​嘅​「​肢體​」​)
    the penis; literally: fifth limb