A fat ass that is just so round and juicy u can't stand it. popularized by the go-go song. so it's sayed a lot in DC
she got a fatty back oh-oh-oh
by yo muvva August 02, 2005
1 more definition
Top Definition
a round butt; a big butt
Didi you see her.... she's got a fatty back.
by ashey June 04, 2005

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