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1. slack vagina
a loose or un-elasticated vaginal opening that whistles when the wind blows, see also Shawn's mom
That girl had such a slack vagina I had to tie a board to my ass to keep from falling in.
by anonymous Feb 18, 2003 add a video
2. slack vagina
a vaginal passage that is so loose it ressembles a pair of loose curtains. possibly due to over use of it be it sexual activities or different.
look at her cunt! it's a really slack vagina!
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