A term that furries or members of the furry community use when referring to sex between furries. Some say that yiff is the sound made by mating arctic foxes, others say it stands for Young Incredibly Fuckable Furry. It can refer to sex that two furries have when dressed up in furry regalia, or it can be a general term referring to anything having to do with sex. Usage can range from “Wanna yiff?” or “I’m feeling yiffy” to “He’s very hot, definitely a yiff.” See furry.