When to use taking a joke way too far in Korean
Korean: 뇌절[ noe-jeol ]

When to use it
뇌절 is a slang word for taking a joke, comment, or action way too far. People use it when something was funny at first, but it keeps going and becomes annoying or awkward. You will often hear it in casual talk or online when friends want someone to stop.
Example sentences
동생이 같은 장난을 계속해서 엄마가 "뇌절하지 마"라고 했어.
My little brother kept doing the same joke, so Mom said, "Don't take it too far."
수업 시간에 민수가 선생님 흉내를 내다가 뇌절했어.
In class, Minsu imitated the teacher and took the joke too far.
공원에서 친구가 사진 포즈로 계속 웃기다가 좀 뇌절했어.
At the park, my friend kept making funny poses for photos and kind of took it too far.
그 얘기 또 하면 뇌절이야.
If you tell that story again, it's taking it too far.
가게에서 친구가 할인 얘기로 장난치다가 뇌절했어.
At the store, my friend joked about the discount and took it too far.
여행 중에 친구가 길을 잃었다고 계속 놀려서 뇌절 같았어.
On the trip, my friend kept teasing me about getting lost, so it felt like too much.