Probably said by the Poles whenever they see Polandball
You hear the cries of angry Poles and Indonesians in the distance.
What is the difference between "flaga" and "bandera"?
The only context when "bandera" is used for a flag, is when it's a flag flown on a ship to indicate nationality.
It has sense. I listen a song called "Piła Tango" and says: "Statek Piła Tango, czarna bandera..."and appears a ship in the video.
I said to check it just for fun: it seems the contraction "ain't" is not accepted as a valid alternative.