A person with above average tech knowledge, who, upon learning you have a new "gadget", peppers you with technical questions he knows you don't know the answers to, in order to stump..therefore embarrass you, making you feel as though you may not actually deserve to have the gadget.
Suzi: Look at my new digital camera.
Dean: Oh cool, how many maga pixles does it have? How many millimeters is the zoom? Is it HD?
Suzi: ..... um, I don't know...it was a gift you Tech Bully.
Dean: You really should know that.