Still images and/or motion pictures involving animals engaging in some kind of sexual act, whether it be with another animal or a human being. The animal, though, does not have to be furry in most cases.
Barack Obama: I look at furry porn.
Michelle Obama: Oh.
Barack Obama: I just watched a hairless cat get fucked by a dude.
Michelle Obama: I'm pretty sure that's still furry porn. Look it up on Urban Dictionary.