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#1 TOP DEFINITION
갑분싸 — sudden mood killer. Short for 갑자기 분위기 싸해졌어 (suddenly the atmosphere turned cold). When an awkward moment or piece of information kills the mood at a fan event, in a group chat, or during a live broadcast. Often used humorously to describe tonal whiplash in variety shows.
Example
“The host asked about the dating rumors right in the middle of the lighthearted game segment — instant 갑분싸. You could feel the whole studio tense up.”