A faster, simpler, more optimal way of describing something as being dummy thiccc. Most commonly used to describe booties of people.
Example 1:
Person 1: Damn, look at dat ass over there!
Person 2: Shit, dat ass is dumpy!
Example 2:
Person 1: Damn, I wish I had a dumpy ass.
Person 2: It's easy! All you gotta do is a bunch of squats! Not only will your ass be dumpy, it will also make your thighs and quads dumpy too!