"맛있어 죽겠다" (I'ts so delicious that I could be die. = delicious to a fault) Namely, he/she implies the emphasis to "delicious" Another examples : 좋아 죽겠다 : I'm in an agony of joy. 행복해 죽겠다 : I'm deeply happy 기분이 나빠 죽겠다 : I feel too bad. 아파 죽겠다 : I feel terribly sick. "그래도 죽으면 안된다" (jokingly) Even so, do not die by that "보고싶어 죽겠다" (I want to meet you so acutely that I might be die.) Namely, he/she want to do very much. 한국사람 다 됐네 (literal translation : You have almost become a complete Korean) Which means : 1. You can speak Korean very well like Koreans. 2. I think you're acting like Koreans. 3. I'm a little surprised that you understand Korean cultures so perfectly well.