chingon was formed by film director robert rodriguez to record songs for his 2003 film "once upon a time in mexico". they contributed to "mexico and mariachis", a compilation album to rodriguez' "mariachi trilogy", and released their debut album, "mexican spaghetti western", in 2007. the band's name comes from a mexican slang term, "chingón", loosely but closely enough meaning "badass" and/or "the shit".