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Jyutping hai6 mat1 dung1 dung1
Pinyin xì miē dōng dōng

Definitions (CC-CANTO)
  1. what the heck is it? [colloquial]
Examples (粵典–words.hk)
  1. 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."