Would it mean the same if I just say "get out here" instead of "get outta here" or "get out of here"?
No, these two phrases have opposite meanings. "Get outta here" and "get out of here" means to leave a location. "Get out here" is a demanding phrase that tells someone to come into the same room or location as another, usually because he is in trouble for something. Ex: Let's get outta here. This place gives me the creeps. Ex: I want to get out of here. I don't like it here. Ex: Get out here right now! Ex: You get out here this instance!