Kosnane
Kosnane is a term used to describe someone whose mother is a whore (jendeh). Unlike koskesh, which can be used as a term of endearment towards friends, kosnane is used solely as an insult.
Hassan: that kosnane hasn't given me the money he owes me yet!
Behnam: when I find you, I'm gonna kill you, you kosnane!
Behnam: when I find you, I'm gonna kill you, you kosnane!