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.
Nerdfighters, we fight with our brains.
Nerdfighters, we bring the frakkin' pain.