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
Apprendre une langue, c'est faire un voyage différent chaque jour.
from Fle pour les curieux