Behavior associated with Furries, I.E. dressing up like an animal (wearing a Furrsuit), having sex with plush animals, having sex with people dressed up as animals, drawing naked or semi-naked pictures of human/animal hybrids, obsessive-compulsively playing Starfox, Jacking Off to previously mention pictures, participating in Wolf and/or Warrior Cat RPs, or just being a Furry in general.
Furrfaggotry is like a disgusting, slimy by-product of Internet culture. It most commonly appears on 4chan, further proof that all forms of dignity have migrated elsewhere, but unfortunately also plagues otherwise entertaining sites such as deviantArt. The only know cure for Furrfaggotry is a shotgun blast to the face.
Todd: I looked at 4chan yesterday, holy shit, i've never seen such furrfaggotry in my life...
Bill: Why the fuck where you even on 4chan in the first place...
Mike: I saw a sign for a furrsuit convention at the community center today, god knows what furrfagotry is going on in there (Shudders in horror)
Steve: I don't even want to think about it...