by Scott Henry March 6, 2008
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.
by brandy kim April 19, 2011
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."
"Oh broski, I left it on that bitch's shelf ass ahead of us in the line in Wal-Mart."
"What the fux, bro."
by SpykeIzLeet August 21, 2011
Noun: a butt characterised by the sharp right angle from one's back, to the top of their ass. The thighs blend straight into the booty, but somehow it is very distinct from the back. It looks like they sat down for so long that their ass flattened out. The sharp angle makes it look and act much like a shelf.
by Chronus Pseudonymous October 30, 2018
by Anonymousshelfass January 3, 2016
by kahner April 30, 2005
by Society Against Fat Asses (SAFA) February 5, 2003