What is "besoil"

Usage examples of "besoil".

But what made the xoph so loathsome was that it was snowy-white, a repulsive albino thing, its stalk-like legs and bloated belly shaggy with stinking white fur, besoiled with oily droppings.

Fungus still hung from his besoiled garments and his fine blond hair, and more was scattered on the floor, glowing dimly.