Top Definition
It refers to someone where they have taking a piss through there underware and left it for 1-2 weeks as it was left moist, mould starts to grow in the crotch regeion giving the effect of mouldy underware
Robert had a poo bum and didnt wipe it, after a couple of weeks he had mouldy underware
#mouldy underware #mouldyunderware #under ware mouldy #mould under ware #mouldy under-ware
by Boardy August 08, 2009
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