|Date||Aug. 28th 2009|
Skins is the 629th xkcd comic.
Furries are people who like to dress up as and behave like animals for fun. In this comic, this subculture is turned around. Cueball goes to a convention with furries whose "internal animalistic instincts have a thing for pretending to be human".
So the joke here is that there are humans that pretend to be animals that pretend to be humans. A recursive bahaviour that doesn't lead anywhere in the end.
"There's Livejournal drama between those who want to wear human suits over fursuits and those who just take off the fursuits."