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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."
by jfkst6 October 31, 2012
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