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2.
Buttlips are the part of the butt cheeks that hang below one's shorts... Just that little bit of cheek that is not the front lips, just the butt lips.
Every time my girlfriend wears her running shorts I can see her buttlips hanging out.
by Cooper2013 July 11, 2013
 
1.
A butthole that is so beat up and streched out it looks like a worn out vagina.
John has some severe butt lips.
by Urippities poop head May 23, 2007
 
3.
1.when the lips of a vagina are removed and surgically place on the anus, thus having butt lips

2. after having lots of butt sex your anus becomes so loose it hangs out and creates lips
Casey kissed me on my butt lips
by THE SHOp March 08, 2007