melon bottom 

A booty way bigger and more juicy than an apple bottom.

That girls apple bottom is nice, but I prefer my wife's melon bottom.

melon bottom by The 39 HAndy men March 7, 2017

bottom melon 

The part of the human buttocks that peeks from beneath revealing/short clothing. An example would be wearing a towel in such a way that it rises just above the very lowest part of both buttocks.

Those shorts really show off your bottom melon!

bottom melon by Diction Donkeh December 10, 2015