Means "foul word" in Polish. There are many foul words in the Polish language. Its vocabulary is various. Some words mean one exact thing, but some have different meanings
Kurwa, Kurwa Mac, Pierdolic (ja Pierdole! means "fuck" or "shit" reffering to the situation), huj w dupe (dick up the ass, when you say "huj ci w dupe" it means FUCK YOU) and many many others
person1 - Kurwa mac, ja pierdole!!
person2 - Musisz takie wulgaryzmy uzywac?
#1 - Fuck, Shit!
#2 - Do you have to swear like that?