Mort de rire, often shortened to MDR, is the French equivalent of LOL or dying of laughter in everyday texting and social media. The phrase has been used in French internet culture for years in comments, messages and memes before short laughing clips spread on TikTok and other video platforms. As a sound, it became a quick shorthand for a reaction, letting creators mark a moment as funny without showing their own face or recording a laugh. It remains popular because the expression is widely understood and the reaction is universal.