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A vaginal opening that has become so loose, as to merge with the anus and become one all-purpose mega-hole.
Ashleigh engaged in so much fisting that she now has a cuntbutt.
by J-Fi June 26, 2005
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To duck beneath a females crotch, preferably one wearing a skirt, and to jump with great force, driving the top of your head into their cunt.
Woah Paul, check out Matt cunt butting Chloe!
by Mr Conor September 21, 2006
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