The Colossal Titan is one of the Nine Titans in Attack on Titan, the manga by Hajime Isayama that became a hugely popular anime series from 2013. As the largest Titan, standing far above the walls protecting humanity, its appearance is usually accompanied by steam, destruction and this unmistakable roar. Clips of the sound spread through anime edits, reaction videos and short-form memes, where creators reuse it as shorthand for something enormous, terrifying or unstoppable arriving. It remains popular because the sound alone instantly signals scale and danger, even without any visuals from the show.