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The foul-smelling oily stuff in the "crack" leading up from your anus and between your buttocks.
"What's this smell on my finger?! OMG! It's crack wax."
One of the many exudates of the human body. It is the slimy, smelly, greasy stuff which lines the crack going from the anus and upward between the buttocks.
This crack wax has got to go. It is making my underwear stink.