Not necessarily smart, just giving off the impression that they are. Often very sheltered from the outside world, spending whatever time on the internet updating their blogs that no one will ever read. Might also be really, really white due to their lack of sun, pasty almost. Not the most athletic people in the world, often have weird farmer's tans. For the most part wears glasses 24/7 and gets mad or irritated when they are removed or are in immediate danger. Often lacking basic important social skills, leading to easy embarrassment.
Yet with all this negative stereotyping toward this particular group. They will almost always make more money then you will ever make and will almost always have a way hotter wife then you will ever get.
"Look the nerds, there they are! Steal their glasses and take them out in the sun. Give them my homework too!"