The exact original recording behind this clip is not clearly documented, which is common for short user-uploaded soundboard audio. What is clear is the word itself: da is Russian for yes, and stretching it into daaaaaa turns a simple agreement into an exaggerated cheer. Online, short vocal reactions like this travel easily because they need no translation to be understood, and they are reused across memes, streams and short videos whenever a creator wants an instant, emphatic yes that feels funnier than a plain spoken word.