Kounibyou

Kounibyou literally translates to "11th grade syndrome" or "2nd year of high school syndrome".
It was first defined and named in Japanese light novel Oregairu vol. 1 page 46.
The actual text of the novel are

“Kounibyou is simply Kounibyou. A common state of mind experienced by high school students. They think that being cynical is cool and always express views that are popular on the internet such as ‘Work and you lose to the system’. When referring to popular novelists and manga writers, they say ‘I like the books they wrote before they became popular’. They mock things that everybody worships and praise those that are obscure. And on top of that, they make fun of otakus even though they are like them. While giving off an air like they understand everything, they spout twisted logic. Basically, they’re unlikable.”