Hyena butter is a secretion from the anal gland of hyena

Hyena

Hyenas or Hyaenas are the animals of the family Hyaenidae of suborder feliforms of the Carnivora. It is the fourth smallest biological family in the Carnivora , and one of the smallest in the mammalia...

s used to mark territory

Territory (animal)

In ethology the term territory refers to any sociographical area that an animal of a particular species consistently defends against conspecifics...

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.