Karl Ess is a German fitness entrepreneur and YouTuber known for vegan bodybuilding content and a blunt, motivational speaking style in the 2010s. Clips of his most forceful lines later circulated beyond fitness circles as a meme sound on German social media and soundboards. The phrase faule Ratten became shorthand for calling out laziness, especially around training and discipline. Its continued use comes from the contrast between serious coaching intent and meme humour, allowing creators to reuse the line in completely unrelated, everyday situations.