An obese or morbidly obese person that you might see walking outside. These creatures tend to be elusive and by themselves, making them exceptionally rare in outdoor situations, but can be seen congregating at buffet lines and Cinnabon stores. They are easily distinguishable by their camouflaging characteristics of having regular buttocks and frontal buttocks as well as frontal and rear breast flaps as to confuse people of exactly which direction they are moving.
Holy crap, you would have dented your car if you hit that Urban Manatee.
Man, they had nothing left at the lunch line. The Urban Manatee ate it all.