Similar to Spielberg's The Terminal and the fictional country of Krakozhia, the movie also has a fictional country roughly from the same geographic region. This one is called Schlupsk. Though while the movie treats Schlupsk as a country, maybe they are referring to Słupsk which is a city in Poland. Which would both make sense geographically and would explain the character's dislike of Polish people. The movie also has a lot of references to the Kazachs which are associated with the Ukraine more. A home country of Seth Rogen's ancestors.