The phrase itself is straightforward French for Kevin, you disgust me, and its appeal online comes from how blunt and reusable it is. As a short reaction clip, it travels easily between French-speaking meme pages, short videos, and chat replies, where it can be aimed at almost any person, character, or situation named Kevin, or used more loosely for anyone behaving disgustingly. Its brevity makes it ideal for quick edits, and because the disgust is stated so plainly, viewers understand the joke even without knowing any wider context.