What does Black Butter mean?

Black Butter meaning in Urban Dictionary

This is the Dark butter-like material that accumulates regarding the taint and in the asscrack whenever you have not showered in a number of years. It is a mixture of sweat, some fecal matter possibly, and lord just knows exactly what else. It has the aroma of the death of delight, and is the best reason for swamp-ass. It really is disgusting.