Trying to get a juicy shelf-booty (as a guy, 22yo) Hello my loseit friends!

As I continue to slim down (I'm 0.5lbs away from my -15 lbs flair!!), I am now shifting a focus to combination weight loss and muscle growth. At the top of the list is the booty. 

I want a ghetto booty/shelf butt/juicy ass! I switched from the elliptical to the stair master for my cardio today. Wowza, the stair master kicked my ass. But I'm also doing squats. Any other ways to keep fat and muscle around my butt to build it up?