The available information on this sound is limited, and the upload title identifies it only as Derpling Idle 1. It appears to be a very short idle audio cue associated with a game character or creature, which is why people search for it simply as derpling. Clips like this spread because editors want tiny in-game sounds for reaction timing, parody game menus, and character-focused memes. Its usefulness comes from its brevity: it is easy to place between cuts without covering dialogue or other important audio.