This line comes from the Polish version of Stronghold, the castle-building strategy game released in 2001 and known in Poland as Twierdza. In the game a narrator warns the player whenever the stockpile runs out of free space, and this particular warning became a running joke among Polish strategy fans for how often it interrupted ambitious building plans. It spread through gameplay clips, funny moment compilations and meme soundboards, and it survives today because the deadpan delivery turns any full inventory into a punchline.