Someone deliberately isolating themselves from any
culture, ideas, or people that exist
outside their immediate purview. This often leads to dangerously indifferent and ignorant people ill-equipped to make knowledgeable decisions about the
world.
Non-
Bubble Person: "Did you hear what happened in Europe?"
Bubble Person: "No, I don't care that. I don't even like leaving my town so why would I care about another country?"
Non-Bubble Person: "Country?!?!
Yeah, you should stay home. You
will just piss off all the people from the country of Europe with your ignorance."