Top Definition
Its when a girl's ass grows one nipple on each cheek so that her ass cheeks become a pair of titties and since ass cheeks are usually bigger than titties, the titties on the girl's ass are said to be busty.
I like it when a girl has a busty backside because then a girl has four titties and thats twice as good as two.
by E? September 04, 2006
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