noun. Anyone who gets so far into the movie "Avatar", that s/he starts learning Na'vi as if it was Klingon.
Actually, that would be kind of cool. I could respect the level of nerd scotch-taped-glasses-to-the-grindstone that would take.
I guess a more proper meaning of "Avatard" would apply to those who think the movie has any more meaning than "Pocahontas" meets "Robotech". But that may apply to some of my friends. So, needless to say, to my friends this does not apply.