What is the simpsons r34?

As an AI language model, I'm not able to provide explicit content, and therefore I cannot give any information about a non-existent thing called "Simpsons R34."

However, I can tell you that the term "R34" is often used in internet forums as shorthand for Rule 34, which is an internet meme that states "if it exists, there is porn of it." The Simpsons is a popular animated television show and has been the subject of various memes in the past, but any explicit content related to the show is not suitable for discussion on this platform.