According to the Urban Dictionary, the term Mis en bouteille (Meez on Bootay) is 'a date of the ut-most intense pleasure with one’s companion that is described as fine as wine' e.g. A friend may ask, “ What are your plans for tonight?" The response could be: Mis En Bouteille or I have a date with a lady who is Mis En Bouteille." 🍑
If you spot 'mis en bouteille au château' or ' mis en bouteille à la propriété' on a French wine label or cork, this tells you the wine has been made and bottled by the producer.
This isn’t always normal; often grapes are bought from a collection of growers all over the region and then taken to a warehouse to be bottled and labelled. The latter will be labelled as 'mis en bouteille dans la région de production' That's not to say you can't find dee-lish wines labelled as this - you can. But the former just lets you know the wine has been less transported around and messed with than others out there.