The Croatian one sounds really like Serbian.
Here is translated literally, but meaning is “Go fuck yourself!”
Some Bulgarian colorful curses:
Майната ти!(Maina ta ti) - means “Your mother’s” but actually is ours Fuck you(the polite one)
Кон да ти го натресе(Kon da ti go natrese) - Be fucked by a horse
Да те еба в устата;ушите;гъза…(Da te eba v ustata;ushite;gaza)- Fuck you in the mouth;ears;ass - Basically wish to fuck whatever holes you have on your body depending on the occasion :)