The phrase donde esta la lista translates from Spanish as where is the list, and that simple meaning explains most of its online use. Without a confirmed source attached to this clip, it circulates mainly as a short reaction sound that Spanish speakers and non speakers alike can drop into chats and edits. It works for roll calls, inventories, waiting lists and to do lists, any situation where an expected list should be present but is not, and the question needs to be asked out loud again.