Haz patria, mata a un chilango, “serve your country, kill a chilango,” was a slogan against people from Mexico City who moved to other parts of the country in the 1980s. A chilango is a person from Mexico City. A 2009 article in the magazine Chilango says that it spread “como un graffiti anónimo contra los invasores” (as anonymous graffiti against the invaders).
A 2015 academic article on the anti-chilango movement in Baja California attributes the slogan to the columnist Héctor “el Gato” Félix Miranda. The same article says: “El antichilanguismo fue un fenómeno de papel” (Anti-chilango feeling was a paper phenomenon).