Top Definition
When a girls ass is so tight/perfect/bubbly that it reminds you of Rihanna's ass. The kind of ass that when she is on all fours you will lick from her clit to the top of her ass crack and love every second of it.
"Man, I love that girl's ass. It's perfect! She's got that riri booty. "
by Floyd Rose May 19, 2014

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