Mdr comes from French texting slang, where mort de rire is the local equivalent of laughing out loud in English. It spread through early chat rooms, forums and text messages long before short video edits, then carried into meme pages and messaging apps. As reaction sounds became a standard editing shortcut, short clips labelled mdr were shared as a ready made laugh response. It remains popular because it crosses language barriers, signals pure amusement in two seconds, and fits the fast, ironic tone of French and international meme culture alike.