Hachishakusama, also called Hasshaku-sama, comes from a Japanese internet urban legend first shared online in 2008. The story describes a woman eight feet tall in a white dress and hat who stalks children, making a deep Po Po Po sound as she approaches. The tale spread through creepypasta forums, horror videos, and later anime and manga inspired appearances, turning her call into shorthand for approaching danger. Online creators still use the isolated Po as a meme cue because fans recognise the legend from that single sound alone.