갑분싸 [ gapbunssa ]
갑분싸 is the abbreviation for ‘갑자기 분위기 싸해지다’.
갑자기 is an adverb, meaning ‘suddenly’, and 분위기, a noun, means ‘atmosphere’ or ‘mood’.
싸하다 is usually used when the feeling or mood is of regret, disappointment, awkward or upset. When -해지다 is used with a root (here, 싸), it adds the meaning ‘to become’.
Koreans use 갑분싸, when the fun or comfortable atmosphere suddenly becomes very cold, awkward, or serious after someone says or does something.
A) (농담을 한 후) 내 얘기 재미있지? ((After some jokes) I am so funny, right?) B) 야, 갑분싸 안보이니? (Hey, don’t you see 갑분싸 now?) (his jokes were not funny at all.)
A) 내일 소풍을 가지만, 숙제 잊지 마세요. (Even though we go on a picnic tomorrow, do not forget the homework.) (then, 갑분싸 for all students)