(Yiffer)Pronounced (Y-I-ph-r)-see (Furry) Slang for Furry. Basically Yiffers are hardcore furrys who dress up in animal costumes and have orgys. Yiffers have an unhealthy obsession with human like animals and have massive "Fur Conventions" and Furry Hentai websites. It is common for them to display animal characteristics. In many cases Yiffers think they are an animal like a fox or wolf, trapped in a human body.
*Not to be confused with beastuality.... but both equally screwed up
A sad excuse for a human being or beings, that would be deemed pitiful, otherwise normally freakish, if it weren't for their afinity to mate with species other than their own kind.
As the yiffer was housesitting a friend's house, so the buddy can run errands, he cut a hole into the friend's teddy bear, f'd it, placed it back on the shelf and pretended that nothing happened when the friend returned.