kvragu

1. Croat. colloq. (expression of annoyance) damn!; dammit!
   Kvragu, opet sam zakasnio! — Damn, I'm late again!
   Kvragu, zaboravio sam ključeve. — Dammit, I forgot my keys.

2. Croat. colloq. (with verbs of motion) to hell
   Idi kvragu! — Go to hell!
   Sve je otišlo kvragu. — Everything went to hell.

In Serbia the word is dođavola.