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Jyutping nei5 noeng4 dik1
Pinyin nǐ niáng de

Definitions (Wiktionary)
  1. adj, vulgar
    your mother loving ...
  2. adv, vulgar
    An intensifier.
    • 這玩意兒真你孃的好使!
      这玩意儿真你娘的好使!
      zhèi wán yì r5 zhēn nǐ niáng de hǎo shǐ !
      This thing works really fucking great!