Hyena butter is a secretion from the anal gland of hyenas used to mark territory and to identify individuals by odor. The gooey substance is spread onto objects within the territory of the hyena by rubbing their posterior against the object they mark.
African legends state that witches would ride hyenas and use a gourd full of hyena butter as fuel for the torches they carried through the night.
References
Hyena butter Wikipedia(Text) CC BY-SA