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Jyutping mat1 dung1 dung1
Pinyin miē dōng dōng

Definitions (CC-CANTO)
  1. (slang) what is that?
Definitions (粵典–words.hk)
  1. 代詞
    「​乜嘢​」​、​「​咩​」​比較​得意​嘅​講​法​,​指一樣​講者​唔​肯定​或者​識別​唔​到​嘅​物件
    what, used to refer to something the speaker cannot identify
    • 「呢樣係乜東東啊?」 「係手提電話。」
      「呢样系乜东东啊?」 「系手提电话。」
      ni1 joeng6 hai6 mat1 dung1 dung1 aa3? hai6 sau2 tai4 din6 waa2.
      "What is this thing?" "This is a mobile phone."
Definitions (Wiktionary)
  1. pron, Cantonese, humorous
    what
    (syn.) 什麼東東, 乜嘢, 什麼, 什么东东, 咩, 乜, 什么
    • 你搞乜东东啊?
      你搞乜东东啊?
      nei5 gaau2 mat1 dung1 dung1 aa1?
      What are you doing?
Definitions (Kaifangcidian)
  1. 啥事兒 – 啥事儿
  2. 什麼東西 – 什么东西
  3. 啥玩意兒 – 啥玩意儿
  4. 什麼東東 – 什么东东
Examples (粵典–words.hk)
  1. Cantonese
    乜东东
    乜東東
    mat1 dung1 dung1
    • what
  2. Cantonese
    搞乜东东芫茜葱
    搞乜東東芫茜葱
    gaau2 mat1 dung1 dung1 jin4 sai1 cung1
    • What the heck is going ahead?
  3. Cantonese
    「呢样系乜东东啊?」 「系手提电话。」
    「呢樣係乜東東啊?」 「係手提電話。」
    ni1 joeng6 hai6 mat1 dung1 dung1 aa3? hai6 sau2 tai4 din6 waa2.
    • "What is this thing?" "This is a mobile phone."