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A popular French swear word in Quebec, hostie or osti is the French word for “host,” the round bread consecrated during the Eucharist. But this is not the religious "host," it is used to express frustration or disdain.
Similarly, what does Osti de Tabarnak mean?
Use. A very strong way to express anger or frustration is to use the words tabarnak, sacrament, and câlice. Non-religious terms may also be strung together in this way, as in Mon crisse de char est brisé, tabarnak de câlisse (literally, "My Christ of (a) car is broken, tabernacle of (the) chalice").
Considering this, is Zut a bad word in French?
Zut alors or zut ! Zut which is more common than the old-fashioned “zut alors” is actually just a very polite way to say merde. It's like saying “shucks” or “dang” to avoid swearing in front of people you shouldn't swear in front of. So feel free to use this one as it won't get you into any trouble at all.
Tabarnak is considered to be the most profane. In its full glory, you might hear something like: “Osti de tabarnak de sacrament, de câlice de ciboire de criss de marde!” The expressions can take on different spellings, and are often pronounced slightly differently from the official words.