Top definition
1.A large vagina
2.A monstrosity of a vagina
3.A large, monstrous vagina
Johnny: Last night i boned this chick with a vagonster!
Molly: OMG! How big was her vagina?
Johnny: It wasn't just big, it was a monstrosoity!
Molly: Yep. That was a vagonster, alright!
by TigelMcBitties May 08, 2010
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