This expression is very handy for someone who wants to add lively mood to describe a mental state or physical sensation. A descriptive verb is added to the expression죽겠어요 (literally means I could die) and its equal to the English expression I feel so...I could die or I am incredibly or terribly so...so...
Here are some examples on the use of this expression:
아버지가 보고 싶어서 죽겠어요. (Abojiga bogo shipeoseo chukkesseoyo). I miss my father terribly.배가 아바서 죽겠어요. (Baega apaseo chukkesseoyo) I have a terrible stomach ache.기분이 나빠서 죽겠어요. (Kibuni nappaseo chukkesseoyo). I'm in a foul mood.내가 너무 슬픈해서 죽겠어요. (Naega nomo seulpeunhaeseo chukkesseoyo). I am so sad I could die.
This expression according to the book ,Continuing Korean, is widely used colloquially.
