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The formation of black scum that forms on the inside sole of a cheap shoe resulting in a rancid stench.
ewwww what is that black gunk in your shoe?'..

'muldge mate, thats what you get for buying cheap primark shoes'

'yuck look at the muldge in your shoes that is rank'

'I think you better chuck those shoes they are growing muldge'
by Jenken85 July 18, 2009
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