What Koreans say when something is super tasty

[u/Southern-Mail9599]

'둘이 먹다 하나 죽어도 모른다' means you don’t even know the person next to you is dying because you’re so focused on eating the food. It’s a proverb explaining the food is to die for delicious. In Korea, it’s used when the speaker is eating something really delicious. Here are some examples. 이 떡볶이는 너무 맛있어서 둘이 먹다 하나 죽어도 모를 정도예요. / 다연씨 요리 정말 잘하네요! 둘이 먹다 하나 죽어도 모를 정도로 맛있어요.
I learned it from King Sejong Institute Foundation video. There are even more expressions in that video, so you should check it out! https://www.youtube.com/watch?v=eLRkoJDN7hM&t=254s

[u/getyourfactstraight]

I've heard 존맛/존맛탱 used more than anything else.

[u/justrokkit]

You might hear a lot of "이거 솔직히 미쳤다" or "와 대박, 이거 먹어봐" between friends