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adjective/noun: 1. A flatulent backside; 2. a malodorous individual
1. Eating those six jars of past-their sellby date peanut butter has made you a proper runkybum! (also runkyarse)

2. You haven't bathed for over a week now, You're a proper runkybum!
by The Man from MilkTray April 02, 2010
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