So... what is a furry??
Well... In short a furry is a Fan of anthropomorphic (Humanoid) animals.
We here at Fangcon Believe in explaining things in song however, and to that end we present:
The Furry Song V.2 by Kurrel The Raven
For even more information about the furry fandom, check out WikiFur. It's like Wikipedia, but for furries!