When you split Uranus in half, it is "ur-anus." That's why it has a butts joke. Weird.
Split Uranus
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Explanation
Explain Bear
Listen up, buttercup. This joke works because Uranus sounds like "your anus." Get it? It's wordplay using the planet's name to make a childish joke about butts. I bet you think farts are still funny. The joke depends on how you pronounce Uranus.