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If someone is 'fly' they are 'sly' or 'untrue' they are also someone who is a 'dirty fighter' the kind that will follow you to the toilet, then as you urinate they will attack you from behind, most of the time using their head to strike you. When using the term 'fly' to describe someone with this nature, the word fly in normally followed by the 'C' word that rhymes with front
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