A nerd who fights (against the decepticons -- also known as popular
people).
One who is, instead of being made of organs and tissues and whatnot, made of awesome.
The word originated in John and Hank Green's video log projected, called vlogbrothers. While John was in an airport one day (curse those
grey speckled walls), he saw a video
game called Nerd Fighters.
Thus, the legacy of nerdfighting began.