Furcadia

A relatively popular MMORPG, where you play as a furre, or cross between a certain animal and human. Such slang as 'twink' (unfair roleplay) and 'yiff' (sexual roleplay) are used. Instead of gaining experience and stats, you roleplay, meaning you create a character and make them interact with other characters. There are several guilds, or medieval-esque organizations, to join and RP. You can attack other people's guilds, ally with them, etc. Very fun.