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1.
A butt that sticks out so much you could use it for a shelf.
She had such a shelf-ass she could carry the groceries in without using her hands.
von Scott Henry 6. März 2008
 
2.
When one's ass, usually larger female's, stick so far out horizontally that it may be used as a shelf to place items on.
"Hey dude, have you seen my drink?"

"Oh broski, I left it on that bitch's shelf ass ahead of us in the line in Wal-Mart."

"What the fux, bro."
von SpykeIzLeet 20. August 2011
 
3.
Where the back and butt of a person seem to intersect at a 90 degree angle forming a shelf. For which one can rest an arm, cup, or book, like a bookshelf.
DAMN! Check out that shelf-ass on that ho, I could rest a cup on it!
von brandy kim 18. April 2011
 
4.
When someone is really really fat and their ass sticks out and it looks like a shelf. You can put pictures, lamps, or even write a paper on it.
Fat big assed people, usually woman
von Jason 20. Februar 2005