Fursona: A portmanteau of furry and persona. It’s what animal you identify as.
Yiff: The joyful noise furries make when they copulate. Can also be used as a verb, i.e. “last night I yiffed a hot wolf.”
Pawing Off: Masturbating
Scritching: Scratching behind one’s ears
Cuddlick: Cuddling and licking
Huggle: Hug + snuggle
Lagbeast: A mythical creature that slow servers for furry sites are blamed on
Plushie: A stuffed animal that a furry carries as a totem
Otherkin: People who identify with a mythical creature like a wizard of dragon instead of a real animal.
Greymuzzle: Older furry
Therians: People who feel their true spiritual identity is an animal, though they may not dress outwardly as one