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Jyutping si1 mat6 daat6
Pinyin sī mì dá

Definitions (Wiktionary)
  1. particle, ethnic, humorous, neologism, slang, slur
    A meaningless sentence-final particle used in declarative sentences that gives the sentence a Korean-language flavour.
    • 現在流行一個笑話,無論世界各地出現任何傑出人物或某領域成就,最終韓國人總會跳出來説:這其實都是韓國的思密達!
      现在流行一个笑话,无论世界各地出现任何杰出人物或某领域成就,最终韩国人总会跳出来说:这其实都是韩国的思密达!
      xiàn zài liú xíng yī ge xiào huà , wú lùn shì jiè gè dì chū xiàn rèn hé jié chū rén wù huò mǒu lǐng yù chéng jiù , zuì zhōng hán guó rén zǒng huì tiào chū lái shuō : zhè qí shí dōu shì hán guó de sī mì dá !
      A joke that is very popular nowadays is that, whenever outstanding people or notable achievements in any part of the world become widely known, the Koreans will eventually stand up and claim: "This in fact came from Korea, seumnida!"
  2. noun, ethnic, humorous, neologism, slang, slur
    Korean person
    (syn.) 棒子, 高麗棒子, 高丽棒子
  3. noun
    montmorillonite (brand name Smecta)

思密達 [--达]

Jyutping
Pinyin sī mì dá

Definitions (CC-CEDICT)
  1. (slang) (used at the end of a sentence to mimic Korean speech) (loanword from Korean verb ending "seumnida")
  2. (jocular) a Korean
Examples (Wiktionary)
  1. Mandarin
    现在流行一个笑话,无论世界各地出现任何杰出人物或某领域成就,最终韩国人总会跳出来说:这其实都是韩国的思密达!
    現在流行一個笑話,無論世界各地出現任何傑出人物或某領域成就,最終韓國人總會跳出來説:這其實都是韓國的思密達!
    xiàn zài liú xíng yī ge xiào huà , wú lùn shì jiè gè dì chū xiàn rèn hé jié chū rén wù huò mǒu lǐng yù chéng jiù , zuì zhōng hán guó rén zǒng huì tiào chū lái shuō : zhè qí shí dōu shì hán guó de sī mì dá !
    • A joke that is very popular nowadays is that, whenever outstanding people or notable achievements in any part of the world become widely known, the Koreans will eventually stand up and claim: "This in fact came from Korea, seumnida!"