@Greg thats not true. This is a very common and familiar way to ask "where are they". At least in Quebec it is.

What does it mean to be like 'L'étranger' ? I know the book but anyone could hardly tell you much more than to go for other books by Camus because your question is too vague. If that's of any help, I used to read Romain Gary / Émile Ajar and Réjean Ducharme when I was into Camus.

Sorry, I mean non idiomatic. Nobody would say this.

None of those would be acceptable in Quebec. "Ca me fait chier" I think is international and also what I would use in most cases.

Do note that "On suce" is also quite vulgar, not just slang. I've heard all of the above in Montreal and Quebec City (and neighbouring cities).

Let it be noted that is a regionalism specific to France.

This is not the case in Quebec.

I find the first one repulsive due to the separation. I guess a proper comparison would be having "It's" split on two lines. It would be ugly.

@Laure quebecer here. I have never heard "tenir à l'oeil". This seems like an odd version of "garder un oeil sur" which could be a valid variant in this context.

Concernant le dernier point, c'est commun de l'entendre au Québec.