기가 막혀요 · 기가 막힌 (+noun)
to be dumbfounded, to be speechless; to be amazing, to be incredible
Example
이 집 김치찌개는 정말 기가 막혀요.
The kimchi stew at this place is absolutely amazing.
Word parts
기 energy
Literally 'one's energy is blocked' — so shocked you can't breathe.
Good to know
Context decides the sense: shock at something bad, or praise for something amazingly good, like food.
Related words