Then of course they can check out Wikipedia's article on BosWash, and follow the links, and realize of course that Wikipedians are sloppy and clueless as usual. Reading Wikipedia's own article, the term seems to have come from a book by one Jean Gottman. It's obviously never caught on, and a quick scan of Wikipedia's own "Notes" section appears to confirm this:
QUOTE("Note 1")
We decided that combined place names seemed contrived and offered little chance for eventual adoption. Therefore, labels such as “BosWash†to refer to the Northeast or “SanSac†in reference to the combined San Francisco and Sacramento metropolitan areas were not considered.
Notes 2 and 3 don't even appear to contain the term.
And using a Google search, the gold standard of Wikipedian scholarship, yields only a paltry 43,900 hits, making it even less popular and well-known, by Wikipedia standards, than a certain little-known nest of guttersnipes.
Maybe it makes sense to have a BosWash article if only to be thorough, but why would you have a sentence in the precious lead space of the New Jersey article? Why not in articles about New York, Delaware, Pennsylvania, or Maryland? Oh, that's right, because everyone knows that New Jersey is a megalopolis, with flying bubble cars and houses and landfills covering the entire surface. Way to go NPOV-pedia.