blow-in n. an outsider; a carpetbagger. (source: Double-Tongued Dictionary)
Further reading
Need a slang term that can replace just about any noun? Try chumpie. If you’re from Philadelphia, you may already know this handy placeholder word. And there’s Queens, Brooklyn, Staten Island, Manhattan, and … The Bronx — why do we add...
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In the newspaper/magazine world, a “blow-in” is a separate sheet of advertising that is inserted between the pages of the newspaper/magazine by air pressure.
/s/ globalnomad
That’s right. It’s really too common for inclusion as a full entry here, however.