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on9 (憨鳩) is a Cantonese swear word which means foolish, stupid and brainless. It is pronounced as 'on' + 'gau'. ('gau' is the Cantonese pronunciation of '9') It is a friendly swear word to laugh, scold or discriminate other ppl. on99 (憨鳩鳩): very foolish on9 zai (憨鳩仔): a foolish guy on lun 7 9 (憨撚柒鳩): extremely stupid, mostly used to scold others when angry on gui (憨居): a less violent way to say on9
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