The phrase is German slang built around Katoo as the culprit and Essen meaning food, with kackt being a crude word for pooping. Clips with this wording circulate on user soundboards as a short reaction rather than as a longer scene, which is why most listeners know it only as a standalone punchline. Its popularity comes from how specific and revolting the accusation sounds even to viewers who need a translation. That makes it reusable across cooking videos, gaming chats and meme edits where a disgusting twist is the whole joke.