1. What does it mean?
킬링파트 comes from the English-looking phrase killing part. It means the especially memorable line, gesture, vocal moment, or choreography that captures attention and makes people want to replay the performance.
Also written or said as killingpateu
2. The nuance
It is praise, not a reference to violence. Listeners may pick different moments; a 킬링파트 does not have to be the chorus or the longest section.
3. Examples
“나는 마지막 눈맞춤이 이 무대의 킬링파트라고 생각해.”
I think the final look into the camera is this performance's standout moment.
“짧은 애드리브가 킬링파트가 됐어.”
A short ad-lib became the part everyone remembered.
Sources
References support the meaning and usage. Example sentences are written for NoCapWiki.