1. What does it mean?
뇌정지 figuratively describes your thinking coming to a stop. People use it after an unexpected question, a confusing instruction, or a surprising turn in a game, often in 뇌정지 왔어.
Also written or said as 뇌 정지, noejeongji
2. The nuance
This casual expression is not a medical description or a claim that the brain has literally stopped functioning. It usually refers to a temporary blank moment; avoid treating someone else's actual health problem as this kind of joke.
3. Examples
“문제를 다 풀었는데 이름 쓰는 칸을 보고 잠깐 뇌정지 왔어.”
I finished the questions, then briefly blanked when I got to the name field.
“설명을 한꺼번에 들으니까 뇌정지야. 하나씩 다시 말해 줘.”
My brain froze hearing all the instructions at once. Tell me again, one at a time.
Sources
Every Memes: Korean internet expressions
References support the meaning and usage. Example sentences are written for NoCapWiki.