How my sister's friend refered to her horse's penis foreskin.
Sarah: The vet says your horse needs it's sheath cleaned. He can do it but I'll show you how to do it your self, it's cheaper. *wink*
Meliisa: *grins and follows her into the barn*
Me: looks at paper that clearly says "foreskin" not "sheath" *gags and runs behind hay bale*