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A term used for overly large vaginas. Refering to the popular wet weather rubber footwear, Wellington Boots. If a certain level of skankiness is suspected custard can be added to the mix.
Her cunt is like a Welly Boot or Her cunt is like a Welly Boot full of custard.
by Statto December 12, 2005
Wellington boots, as adapted for quick conversation between immature morons such as myself.
'I went out splashing in puddles today.'
'Did you take your wellyboots?'
'Why, yes I did.'
by Stephen W. Thomas March 01, 2005