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4.
butt shelf: an implant into a girl's ass that is so high and large you can place a drink on it.
"The bar was crowded but I found a place on Acea's butt shelf to store my stella."
by David A. Porter January 14, 2010
 
1.
The top part of a nice round booty where the full butt cheeks meet the small of the back. It must jut out and fill a booty-loving man's heart with passionate desire.
Damn, look at that cute little thing with the nice curves. I just want to rest my face on that sweet butt shelf.
by 02050 loves 02333 November 16, 2011
 
2.
The crease under the butt, where the butt meets the leg.
The girl at the beach had a nice buttshelf
by us army May 28, 2007
 
3.
The bottom part of a nice ass where the butt meets the leg. There is definetly a crease. People with elongated asses that blend into their thighs don't have one.
Guys checking out a girl with a nice tight ass: Dude check out the that girl's ass. Do you see the butt shelf?
by Karen/Owen May 13, 2006