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Mostly used in Hong Kong Cantonese slang word Spelling in english: On gau/gao 9 is pronounced "gau" in Cantonese Which also means penis or dick It means foolish, stupid, dumb, especially when describing someone's actions or speech even appearance but not specifically about the target's [intelligence]. This word is commonly used among [youngsters], as it is mildly [offensive] yet usually in a funny way. Still it can be aggressive and provoking sometimes if the tone is not friendly or used in a swearing sentence. In numerous cases, it is transformed into on99 or on-lun-9. The meanings are basically the same.
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