Nerds who fight, usually against popular people. This term originated from the videoblog
Brotherhood 2.0. John Green, one of the two participants in the videoblog, noticed a game called Nerd Fighters at an airport. Eventually, the viewers of the videoblog began being dubbed nerdfighters.
Nerdfighters are considered to be "made of awesome" by John, Hank (the other participant in the videoblog), and other nerdfighters. The nerdfighters often send in pictures of nerdfighter related activities to the videoblog, such as nerdfighter embroidered pillows. It is unknown what will happen to nerdfighting when the videoblog ends.