box booty
A big wide square flat butt.
Jan has a box booty, it looks nice and big from the back but from the side it's flat!
booty box
When one sleeps under the covers and farts, trapping oneself in the aroma of said fart
Josh: Bro, I shouldn't have had that halal last night because while I was sleeping, I booty boxed myself
Kevin: Ew, you're nasty bro
Kevin: Ew, you're nasty bro