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An ass that is big, nice, and round. Usually found on girls.
Aisha has a nice ass.
Jessica has a Fat ass
by Anonymous March 20, 2003
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Nov 27 Word of the Day
A stupid person; it refers to the lack of surface area on an individual's brain. The general thought is that the more surface area (wrinkles, creases, etc.) a brain has, the smarter the person is. Conversely, a person with a smooth brain (no wrinkles) has less surface area and would therefore be stupid.
That fucking smooth brain put his shirt on backwards again...

That smooth brain is dumber than a pile of shit.
by Tip Tank May 14, 2011
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an ass that's round, soft, smooth, and large enough to have something to hold on to in bed, but not so large it has cellulite. Of course this only goes for girls.
dude 1: Can J-Lo's ass be anymore lovely?

Dude 2: no.
by ucddcd June 22, 2005
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Object that will bounce on your cock untill you cum like crazy
Make sure you slap it hard a couple times before you fuck it
Girl: oh yes! Fuck my ass!
Guy: it's such a nice ass and I'm gonna cum all over it!
by Rhugfuvji March 28, 2013
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A tattoo on the left ass cheek of a voluptuous, huge-assed woman named Agnes.
"Isn't that Nice Ass well designed?"
"Look at the Nice Ass on that nice ass! Isn't it breathtaking?"
by Meshtaga2 April 27, 2009
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