How do you say hump day in French?

There isn't a direct translation for "hump day" in French.

The closest equivalent would be "le milieu de la semaine" which literally translates to "the middle of the week".

You could also use more informal expressions like:

* "Le mercredi" (Wednesday)

* "Le jour du milieu de la semaine" (The day in the middle of the week)

However, "hump day" is a very specific English expression that doesn't translate directly into French.