Nerdcore

From Wikipedia:

Nerdcore hip hop, or geeksta rap, is a subgenre of hip hop music that is performed by nerds or geeks, and is characterized by themes and subject matter considered to be of general interest to nerds. Self-described nerdcore musician MC Frontalot coined the term in 2000 in the song "Nerdcore Hiphop".

Trailer for the documentary, Nerdcore For Life, which chronicles the tumultuous world of Nerdcore Hip-Hop:



more info:
http://nerdcoreforlife.com/
http://en.wikipedia.org/wiki/Nerdcore_hip_hop