For me, it may be that the toilet paper roll needs to have the open end away from the wall. I don’t want to reach under the roll to take a piece! That’s ludicrous!
That or my recent addiction to correcting people when they use “less” when they should use “fewer”
That sounds a little bit like a language barrier type deal but that does make more sense to me too, since you are prefacing the Saturday with a unit of time to measure by “week”
It’s really just a shortening of “a week from Saturday”, so more of a dialect than language thing.
If it were a shortening like that, should it not be more akin to a contraction? Because also based on who you talk to, that’s also not entirely true, some people feel that the meaning of “next” could mean “this” or “the following” based on what day of the week it is. If it were Sunday and I said next weekend, do you think that is the upcoming Saturday? Or the following Saturday?