It’s been fun to speculate what you should call each EU country’s potential (yes, unlikely) exit from the EU, but I think we have the best, English language, list here:
A nice runner-up is “Noway” for Norway not entering the EU.
This joke is still valid:
The year is 2192. The British Prime Minister visits Brussels to ask for an extension of the Brexit deadline.
No one remembers where this tradition originated, but every year it attracts many tourists from all over the world.