Mais oui?
My family is still in the area, as are several friends. I’m in Sherbrooke maybe one weekend every month or two, since 2006. Opening in 2007 does explain why I hadn’t heard of it before, though! I know my FIL has been a few times.
In way-over-thinking my methods of profaning, I think I’m more likely to say maudit crisse and ostie tabarnac than maudi tabarnac, but the latter plays “in my uncle’s voice” in my head, so perhaps he’s prone to saying it. I’ve definitely heard it though.
…alors?
Espèce de merde, n’oubliez-pas Trois Pistoles et La Fin de Monde!
Unibroue has some of the greatest beer label artwork ever!
Since I drank a Fin du Monde just 2 days ago, I can hardly say I forgot about it! But it’s not as much of a religious/sacrilegious beer name, is all! 
And yes, the artwork from Unibroue is as good as it gets. Beautiful stuff.
How “cuss-y” is the exclamation “Sacre!”? David Suchet’s Poirot is forever saying it.
It’s about on the level of “heck”… it’s pretty much saying “swear word!” instead of actually saying a swear word.