Nerd is a term that refers to a person who passionately pursues intellectual activities, esoteric knowledge, or other obscure interests that are age inappropriate rather than engaging in more social or popular activities. Therefore, a nerd is often excluded from physical activity and considered a loner by peers, or will tend to associate with like-minded people.
For example, the Geoergia Tech students who developed this video can be classified as NERDS:
Kill the NERDS!!!