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on9 on stetoid. In colloquial Hong Kong Cantonese, on9 means fucking stupid, while 'on' means stupid and '9' has the same pronunciation as 'gau', meaning dick. on9, therefore, means fucking stupid (adj) or fucking idiot (n). 'on lun 7 9' mean on9 to the extreme: lun, 7, 9 all means dick in profanity in Cantonese in Hong Kong. In general, the more variations of the dick you can cram into describing the same event, in this case 'on' (stupid), the more amplified and emphasized is the meaning.
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