Europa-posting is a creative trend on X where users collaboratively build a sci-fi narrative about a fictional war on Jupiter's moon, Europa. It features memes and posts with themes of extreme cold, cosmic conflict, and exaggerated casualties, like "BORN TO FREEZE" and "410,757,864,530 DEAD WARMIES." The meme you referenced humorously depicts a dystopian struggle, blending internet culture with speculative fiction. Users add to the story with surreal details, like "Ice-Zone Zealots" or freezing at -144°C.