bedak

1. slang bummer; drag
   Kakav bedak, koncert je otkazan! — What a bummer, the concert's been cancelled!
   Ceo vikend je bio totalni bedak. — The whole weekend was a total drag.
2. slang (in u bedaku) the dumps; low mood
   Od jutros sam u bedaku. — I've been down in the dumps since this morning.
   Nemoj da budeš u bedaku zbog toga. — Don't get down about it.

In Croatia the word means "fool"; in Serbia it means "bummer" or "low mood".