The phrase comes from everyday Brazilian internet slang, where mlk is a shortened, informal way of addressing a young man and vsf is a blunt profanity used to tell someone to go away. Together with the opening dismissal, the line spread as a short voice meme in chats and social videos because it captures a very specific attitude: complete indifference delivered without politeness. Its brevity makes it easy to reuse, and it remains popular as a reaction sound for shutting down drama, complaints and exaggerated stories.