What weird idioms/phrases does your language have?
In Finnish we have "kissanristiäiset" (literally means a cat's christening), which means some trivial and meaningless celebration/event.
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When we need to count slowly we'll go one Mississippi, two Mississippi, three Mississippi, and so on.
I've always figured that the utility to this one is if you say Mississippi at a reasonable speed, not super fast but not drawn out, it ends up being a pretty reliable way to count a second. So it's not counting slowly persay, it's counting seconds.
In Dutch we just start counting at 21, if we want to count seconds.
“Eénentwintig, tweeëntwintig, drieëntwintig...”