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Jyutping wai2 saam1 gun1
Pinyin huǐ sān guān

Definitions (Wiktionary)
  1. verb, neologism, slang, verb-object
    to destroy one's fundamental values; to be jaw-dropping, shocking, surprising, disappointing, etc.

毀三觀 [毁-观]

Jyutping
Pinyin huǐ sān guān

Definitions (CC-CEDICT)
  1. (Internet slang) (of a situation, video clip etc) to make one think "wtf!"
Examples (Wiktionary)
  1. Mandarin
    毁三观
    毀三觀
    huǐ sān guān
    • (humorous) to destroy one's fundamental values; to be shocking