Frecossais, thank you so much. Yes, such a very lovely word!
What can I give you in exchange that sounds a little like it except saloperie?
That means something like rubbish or things of no worth. I first came across it when I was reading Marcel Pagnol's La Gloire de mon Père. He was in a brocante with his father and they were negotiating to buy something or other (I forget what) and the father said the thing was a mere saloperie.
However, I don't recommend that you try that when you next bargain for something because the vendeur could very well be thoroughly offended
N'allez pas trop vite - Proust