갑분싸
gapbunssa
The mood suddenly went cold — an awkward silence.
OriginFirst syllables of 갑자기 분위기 싸해짐 (the mood suddenly turns chilly).
When to useRight after someone says the wrong thing at a gathering.
CarefulCasual — fine with friends, out of place in formal writing or with your boss.
Examples
전 애인 얘기 꺼내서 갑분싸 됐잖아.
You brought up your ex and the room went silent.