This segment hasn't been seen in well over 6 years, let's get that perfectly straight. Secondly, I have no doubt in my mind that was an unfortunate mistake. I'm sure if they were well aware of the second context that had, they would have changed the line considerably. And Thirdly... kids have NO idea what a furry triangle is. It didn't even pass my mind until someone brought it up to me later. SS is too smart to let intentionally dirty jokes come out like that. In the context of the show, it was a stupid thing a stupid character said to get stupid humor. Sort of like anything Ralph Wiggum would say. Surprisingly, no one else read into it.