씨발 = fxxxing(Adj), 놈(male) = low - life scum, 년(female) = low - life scum, 새끼 = bastard, 개새끼 = son of a bxxxx, 존나 = fxxing(Adv), 병신 = retarded one, 아가리 = mouth, 뒤지다 = to die in a bad manner, 깝치다 = to go over what you are supposed to do
These are most frequently used words. I hear these every single second whenever I walk down the street near my house^^
Ex) ㄱ: 야 이 병신새끼야 너 왜 그걸 이제와서 얘기해?
you retarded bastard why do you tell me now?
ㄴ:아 몰라 미안해 일부러 한 거 아니야.
Ah, I don't know, sorry. It was not intentional
ㄱ:존나 아가리만 놀릴 때 부터 알아봤다 쓰레기 새끼
I was fxxxing already expecting this since you kept speaking out bullshits, you, piece of garbage
ㄴ:듣자 듣자 하니까 개새끼가 말이 너무 심하네 뒤지고싶냐?
As I keep listening to what you bombard on me, now It is out of my limitation, you son of a bxxxx. Do you want to be badly wasted?
Hope this helps you^^. Not everybody swears a lot in Korea.