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Also, some people will type “without further adieu,” which is similarly infuriating.
without further bonjour
Without further omelette du fromage
Frere Jacques, Bonaparte.
They are just trying to finish before more French people leave.
I can’t recall having ever seen it written down so I just assumed it was another French word/phrase bastardized by anglophones. It’s a reasonably safe assumption but certainly has its failings.