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.
ayon kay Scott Henry ika-06 ng Marso, 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."
ayon kay SpykeIzLeet ika-20 ng 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!
ayon kay brandy kim ika-18 ng Abril, 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
ayon kay Jason ika-20 ng Pebrero, 2005

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