Vulgar\r\nUsed in Hong Kong\r\nPronunciation: "on-gau" ("on" in English, "9" in Cantonese)\r\nMeaning: stupid, thinking stupid\r\nMore: [on99]\n> Chief Exceutive Mr.Tung: If China is good, Hong Kong will be good. When Hong Kong is good, we are good too.\n> Citizen A: He's on9.\n> Citizen B: He's on99.\n