It is the Dark butter-like substance that accumulates on the taint and in the asscrack when one has not showered in a long time. It is a combination of sweat, some fecal matter perhaps, and lord only knows what else. It smells like the death of joy, and is the leading cause of swamp-ass. It is disgusting.
The action of a black man pouring pig fat on a sizeable cactus (Arizona variety), and proceeding to sit himself upon the peak of the cactus. In a perfect world, the cactus would proceed to penetrate him.
Truffle butter is created when you pull your dick out of the asshole and proceed to fuck her in the pussy, the fecal matter, vaginal juices and semen combine to form a tan buttery substance in and around her pussy; truffle butter.
Black truffle butter is created when the woman is menstruating.
The entomology of the term stems from the English black pudding or the French boudin noir, both made with blood.
A black butterfly is a butterfly often symbolizing death. Though it does not mean "to die" but to have something come to it's end. These are said to appear to foretell the end of something, and said to appear to one who is near death. They are both mythical and real. I mean mythical because of the stories accompanied with them, and they are real because there are many butterflies who are many black.