Not “here, here!” Does that even fucking make sense? No! “Here, here!” is what you would say if you found the treasure and wanted to let the other pirates know where it was. Or if you're a forward in the Primera Liga and you're making a run into space, and you're yelling, "aqui, aqui!" to your holding midfielder to make the pass. But if you are trying to voice agreement with a particular statement, as though you might be encouraging people to listen to it, then it's "hear, hear!"