Yiff Share definition Flag A word used by furries which actually means "yell and sniff", but furries use it as a verb which means "having sex". Furry guy 1: hey, wanna yiff? Furry guy 2: sure! *yiffs Furry guy 1* Yiff by Awooooooooooooooooos December 28, 2018 0 0 Get merch Get the Yiff mug. Buy Now — $32.95 See more merch