Definition of 兄ちゃん
- (n) (my) older brother
兄ちゃん、こっち生中二つー。
Kiddo! Two medium-size drafts here. - sonny (with a nuance of suspicion); lad
「どいてください」「やんのか?あんちゃん」
"Please move aside." "Ya wanna make something of it, sonny?"