Micturated

I just want to understand this, sir. Every time a rug is micturated upon in this fair city I have to compensate the person?
Jeffrey Lebowski — The Big Lebowski

Me: Why does that word exist?
My sister: What do you mean?
Me: “Micturated.” It means “urinated.” Why not just say “urinated?”
My sister: He wants to look more dignified.
Me: But it doesn’t make any sense. “Micturate” is actually a more recent word than “urinate” – I looked it up. So why was “micturate” created?
My sister: …that’s just the way english is.