The smile formed by the bottom of a woman's ass cheeks. Must be a small tight ass to make a smile and not an ass grimace. Usually present on slender chicks.
I nearly starched myself after seeing her ass smile in those tight jeans.
by Smiley Ass March 29, 2007
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To be a great person who brings delight to the world.
Man, did you see that lady? She brings me so much joy. She's got an ass that smiles.
by trufrend June 8, 2009
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