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I am assuming that you are a non-native English speaker and that this is a serious question and not a joke.
Uranus is pronounced one of two ways, and both are funny if you like toilet humor.
Your-Anus, the joke here being that anus is the scientific word for your asshole, butthole, cornhole, etc.
Urine-Us, the joke here being that urine is the scientific word for pee, piss, R-Kelly juice, etc.