Fee fi fo fum comes from the traditional tale of Jack and the Beanstalk, where the giant chants it while hunting for intruders in his castle. Pee pi po pum keeps that same four-beat rhythm but replaces the menacing words with playful nonsense, turning a threat into a joke. Shared as a short soundboard clip, it spread through memes and edited videos that use recognition of the original chant for instant comedy. Its appeal is simple: almost everyone knows the pattern, so the silly twist lands immediately without any explanation.