Cream Pie

A cream pie is a reproductive organ common to all Humorans which acts analogously to the testes found in many other vertebrate species, producing sperm vital for reproduction. 
Typically, a cream pie is located in the center of a humoran's skull, attached to the seminal ducts which allow the humoran in question to expel aerosolized sperm into the air for mating purposes. Some clown species have removable cream pies which they may place in a location to allow for the insemination of passing clowns, or which they may offer directly to other clowns for reproductive purposes. 
As all members of Humora are hermaphroditic, some are capable of self-fertilization through the introduction sperm directly to the ovaries. However, most humorans are anatomically incapable of such an act, their seminal ducts being specifically routed to allow for only the outward excretion of semen. 
Clowns, similarly to ostriches and emus, have been known to show sexual attraction to their human masters, and thus will on occasion attempt to cream pie them.
This organ is also the origin of the human term "cream pie"