んじゃねぇ

don't; isn't

→ の
phrase Rare #34,997
don't; isn't A rough, informal form of んじゃない. After a verb, it can tell someone not to do something; in other contexts, it can express that something is not the case.
JA: そんなに急ぐんじゃねぇ。
EN: Don't rush so much.

無茶するんじゃねぇ

Don't do anything reckless.

— イノセンス (2004)

遊びに来たんじゃねぇんだからな

I'm not here to mess around, you know.

— 天空の城ラピュタ (1986)

罠にかかるんじゃねぇよ

Don't fall for the trap!

— Demon Slayer -Kimetsu no Yaiba- The Movie: Mugen Train (2020)