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もんじゃねえ

shouldn't

→ もの
phrase Rare #44,196
shouldn't A rough, informal contraction of ものじゃない. Depending on context, it can also mean “isn't” or “isn't all that bad.”
JA: そんなことを一人で決めるもんじゃねえ。
EN: You shouldn't decide something like that on your own.

馬鹿なこと言うもんじゃねえ

Don't say stupid things.

— Tampopo (1985)

聞いたことを何でも信じるもんじゃねえ

Don't go believing everything you hear.

— 罪人たち (2025)