Booty-per-capita

A unit of measurement describing the relationship between the size of a female's booty and the size of the jeans into which said booty has been fit.

Daaamn, howd she pack all that ass in those jeans?!? her booty-per-capita is off the charts!

Its too bad Girl A always wears loose fitting jeans. She got a donk but like no booty-per-capita.