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.
di Scott Henry 06 marzo 2008
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."
di SpykeIzLeet 20 agosto 2011
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!
di brandy kim 18 aprile 2011
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
di Jason 20 febbraio 2005

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