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Jyutping jin1 zi1 maa5
Pinyin yān zhī mǎ

Definitions (CC-CANTO)
  1. Yanqi horse; an untamed woman; someone who is unruly or intractable
Definitions (粵典–words.hk)
  1. 名詞、俚語
    比喻​淫​蕩​嘅​女人​、​妓女
    a simile of licentious women, or prostitute
  2. 名詞、俚語
    比喻​難以​駕​馭​嘅​女人​、​刁蠻​、​惡​女人
    a simile of women that are difficult to control; a shrew, a vulgar woman
Definitions (Wiktionary)
  1. noun, Hokkien, Xiamen, dated
    fierce wild horse that runs very fast