Am I being a jerk about this situation?

I have an Acer Aspire mini-notebook and use it almost everywhere, at bus stops, bus, business, and so on. . People like to come throughout the day and questions about it, sometimes when I have my ear plugs in, and I am clear in what I am doing deepened. At first I wanted nothing against it, but now it’s annoying cuz it happens 10 times a day. What is the fastest and most polite way to say to unscrew the people? I am one of those people who can not go to the bathroom without online. Yes, I would stand there with one hand, my laptop and the other hand shakes my thing.