How do you get a thicker body and bigger butt?

There are different ways of doing this. An obvious answer would be to eat more, but that will only add fat. You cannot predict where the fat will deposit, what shape it will take, or how it will look. You can sculpt your body by using exercises. You can target areas, like your butt. As the muscle builds, the area will look larger, but at the same time firmer. Heel raises, jump squats, and single leg bridges are all ways to develop larger butt muscles. Bodies like Jennifer Lopez's take work. She did not get those curves from Doritos and french fries.