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Jyutping waa1 kaau3
Pinyin wà kào

Definitions (Wiktionary)
  1. intj, colloquial
    holy shit; my goodness

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Jyutping waa1 kaau3
Pinyin wā kào

Definitions (CC-CEDICT)
  1. (lit.) I cry!; Oh, bosh!; Shoot! (from Taiwanese 我哭, Tai-lo pr. [goá khàu])