How to say extremely pissed off in Korean
Korean: 빡침[ ppak-chim ]

Meaning
(빡침) is a very casual slang word for a strong feeling of anger or annoyance. It means you are extremely pissed off about something. People usually use it with friends, online, or in texting, not in polite or formal situations.
Example sentences
친구가 내 말을 안 들어서 빡침.
My friend didn’t listen to me, so I’m really pissed off.
버스를 놓쳐서 아침부터 빡침.
I missed the bus, so I’ve been really pissed off all morning.
가게에 갔는데 내 사이즈가 없어서 빡침.
I went to the store but they didn’t have my size, so I’m really pissed off.
집에서 동생이 내 과자를 먹어서 빡침.
My younger sibling ate my snack at home, so I’m really pissed off.