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.
Scott Henryによって 2008年03月06日(木)
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."
SpykeIzLeetによって 2011年08月20日(土)
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!
brandy kimによって 2011年04月18日(月)
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
Jasonによって 2005年02月20日(日)

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