It's a remake of an old (but still popular) pop song, meant to make fun of city rivals Željezničmar. Papak is a slang word Sarajevans use when describing someone who's bring his village behavior to the city. Bordo means Maroon in Bosnian
Lyrics
All these years we f*ck The Blues, And ‘Papak’ from the South (Stand) will always cry, Because Sarajevo is bordo!