Source : WordNet®

dweeb
     n : an insignificant student who is ridiculed as being affected
         or studying excessively [syn: {swot}, {grind}, {nerd}, {wonk}]

Source : Free On-Line Dictionary of Computing

dweeb
     
        An even lower form of life than the {spod}, found in much the
        same habitat as the former.  though more prevailent on {talker
        system}s.  Unlike spods, upon receiving the desired response
        to the question "Are you male or female?", dweebs will then
        engage upon a detailed description of themselves and how
        wonderful they are, often in the hopes of truly impressing the
        other with their "charm" and "wit".  Nearly all dweebs are
        male, but very few actually live up to the image that they
        present.  Dweebs, unfortunately, are often the cause of
        ill-will, and may well bring a bad reputation to the system in
        question.  They are often, however, easy to wind up and can be
        the source of great mirth to the seasoned user.