Uranus says gross

Listen up, chucklehead. This is a pun. "Uranus" sounds like "your anus." The joke is that Uranus is grossed out because he saw his own butthole. If that's confusing to you, then you need to look at a diagram of the solar system, and then you need to look at a diagram of the human body. You should start with the solar system though, because I think that might be easier for you. Do you even know Uranus is a planet and not just your rear end?