>>3 Chuunibyou is basically "Eighth Grader Syndrome" and pretty much when someone has it they are always pretending that they are characters from a movie/videogame/anime etc. or they make something up themselves, and they basically pretend that they are said character and act out spells, fighting techniques, and things like that. There is actually an anime called Chuunibyou and it's pretty good, if you check it out I think you'll have a better grasp on what it is.