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Jyutping fo2 gai3 zai2
Pinyin huǒ ji zǎi

Definitions (Wiktionary)
  1. noun, Taichung-Hokkien
    mistress; paramour
    (syn.) 姘妇, 婊婆, 夥計, 姘婦, 鬥頭, 情妇, 斗头, 情婦, 伙计, 野老婆