Got back
When one has an ass so large that Sir Mix-a-Lot wants to write songs about it; especially when seen walking and in combination with a small waist.
Example:
“I love the way she looks in those yoga pants; she’s got back.”
“Wow, he must work out those buns; he’s got back.”
“I love the way she looks in those yoga pants; she’s got back.”
“Wow, he must work out those buns; he’s got back.”