There are 3 main meanings for the polish word kurwa:
1. literally a whore, prostitute
2. a highly offensive term for a woman
3. used as world "fuck" in English language.
Sometimes its also used instead of a comma (of course I mean in the speech - it gives time to think about next words and makes the speech/sentence more emotional)
Kurwa! Ewa mnie zdradzila! To zwykla kurwa nic wiecej! Gdyby tu byla zabilbym kurwe golymi rekami!
(Fuck! Eve cheated on me. She is nothing more then a whore. If she were here I would kill that bitch with my bare hands.)