Tabernac is the strongest/worst swear I know if in Québeqois. You could use it, though I would be more inclined to go with 'O, Colisse' which literally means 'oh challace' (weird I know) or 'Ah, Mon Dieu' which is 'Oh my God'.

I usually hear both of them with little words like Oh or Ah at the beginning, though in both cases they are not really necessary. Most of the time René says these things on a groan or in a whine. Tabernac is said forcefully like 'fuck!'

Context is key. You should see what passes for swears in Chinese!