Et la santé !
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He is jailed in a jail nicknamed "La Santé", which is also the the french cheers sentence. "À la votre *et la santé".
Will be the running gag of this christmas and new year.
But got covered by Wikipédia "https://fr.wikipedia.org/wiki/Prison_de_la_Sant%C3%A9", so I did called it a nickname too.
I'm pretty sure it can be called a "Métonymie de lieu" but I just didn't want to insist about that, it feels a little pedantic.