Tiếng Việt · Slang Attested

mất não

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In real, traceable use. Part of the curated seed collection; community review is coming.

Both English Tiếng Việt

Meaning · English

Brainless-mode — doing something so dumb your brain looks uninstalled; usually self-deprecating or teasing.

Nghĩa · Tiếng Việt

làm việc ngu ngốc như não không còn

Machine-translated — suggest a fix

Literally: lost the brain

Examples

Ra đề dễ vậy mà làm sai hết, đúng kiểu mất não.The test was that easy and I still botched everything — total brain-gone moment.

Editorial example (batch 046)

Sources & notes

Discovered via slangviet.com (headword reference only; definition and example written independently for Idiomer). Retrieved 2026-08-05. Reference page: slangviet.com/phrases/mat-nao.

Topics: Gen Z slang

Common questions

What does “mất não” mean?

Brainless-mode — doing something so dumb your brain looks uninstalled; usually self-deprecating or teasing. Literally: lost the brain

Is “mất não” formal or informal?

mất não is generally informal.

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