Kurva
A slang swear word used in many East European languages, or under Polish spelling - Kurwa.

Literally meaning whore, bitch, slut, but can also be used when something happens and you are very surprised about it, but can mean good things.
You kurva!! Get out of my face! I don't wanna see you again!!

Oh KURVA!! I lost my wallet!

Oh kurva! Germany has gone to the final!! Yay!