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Jyutping aa3 mau5 mau5
Pinyin ā mǒu mǒu

Definitions (粵典–words.hk)
  1. 名詞
    對​唔​知​佢​咩​名​嘅​人​嘅​稱​呼
    an indefinite way of referrring to someone whose name is unknown

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Jyutping aa3 mau5 mau5
Pinyin a mǒu mǒu

Definitions (CC-CANTO)
  1. an indefinite way of referring to someone whose name is unknown; Mr so-and-so