멘붕

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What it means

A mental breakdown — total panic or confusion.

Where it comes from

Short for 멘탈 붕괴 (mental collapse).

When you'd use it

When everything goes wrong at once.

Example

파일이 다 날아가서 멘붕 왔어.All my files disappeared and I totally panicked.

Careful

Casual — fine with friends, out of place in formal writing or with your boss.