Actually, it’s a term use by many Americans across the country to denote conservative White Americans who feel anyone who isn’t like them racially and/or ideologically isn’t a “real American”.
It was popularly used during the 2008 elections to satirize Sarah Palin’s "Real America speech* and also those who accused then Presidential Candidate Obama of being a “Kenyan Muslim” and refused to accept the documented fact he is an American citizen born in Hawaii.