Words, words, words

I do love words, their derivation and usage- and mis-use!
This word-of-the-day is one I've never heard, read, used or even remotely known about. Contumely?
What?

Now I'm thinking of a word that made me smile on a recent cab ride to the airport. With a very loquacious driver. He told me every detail of his 17-year-old daughter's life, including how he was teaching her to drive. He was the better person to teach her because his wife was such a backside driver. That's what he said: backside driver. Now I just love that!

Can't you totally see a character in a book misusing Backseat Driver like that?? He was a great guy, so entertaining. I wanted to write down everything he said.