mulecup Share definition Flag When one cups his hand, farts in his cupped hand and hold it to the mouth and nostril of a buddy, much like a mule's feading bag. After sex, I gave my lesbian girlfriend a mulecup and kicked her ass out of my bed. mulecup by jeff April 1, 2005 0 0 Get merch Get the mulecup mug. Buy Now — $32.95 See more merch