A not-so-alien race of sentient beings once evolved to the point of such supreme efficiency that their bodies no longer required expelling solid waste matter. They just pretty much farted through their pores, which meant stockholders in body deodorant companies enjoyed very early retirements. But the aliens then completely consumed their planet, deflating the tire on its cycle of life. They came to realize that "Our species needs feces."
Some of these beings now reside on our planet, seeking the plentiful "brown gold" to attempt to replenish their dying home world. Infiltrating our planet's politics, legal matters and education systems, they have already immersed themselves in the deepest shit our society can produce.