Meaning of 中二 in Japanese

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Definition of 中二

ちゅうに(chuuni) 【中二 ·中２】

(n) second-year of junior high
私は中二で学校を退学した。
I dropped out of school when I was in the 7th grade.

ちゅうにかい(chuunikai) 【中二階】

ちゅうにびょう(chuunibyou) 【中二病 ·厨二病】

(n) behaving in a way characteristic of teenagers going through puberty, esp. by being overly self-conscious; 2nd year of junior high sickness

兄ちゃんにいちゃん、こっちこちら生中二つー。

Kiddo! Two medium-size drafts here.