- 1. Vulgar Used in Hong Kong Pronunciation: "on-gau" ("on" in English, "9" in Cantonese) Meaning: stupid, thinking stupid More: [on99] > Chief Exceutive Mr.Tung: If China is good, Hong Kong will be good. When Hong Kong is good, we are good too. > Citizen A: He's on9. > Citizen B: He's on99. Source: ecdict
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