Keyboard smashing has been a staple of internet chat for decades, used to show laughter, frustration, embarrassment, or having no words at all. A random string like asdfghjksadfghj signals that the sender gave up on real language, and turning that idea into a one second soundboard clip keeps the joke in audio form. It circulates as a throwaway reaction rather than a clip tied to a film, show, or creator, and its lack of a clear source is part of why people reuse it for any messy, speechless moment online.