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I've already been in Croatia and i can't remember «Bok» but again i can't barely remember the whole trip.

So what does the word mean? Hello??

Bog or Bok is in Croatian language a colloquial, especially among close acquaintances, friends  customary salute, which is used both in greeting as well as a farewell. The greeting is an isolated interjection (Bog!), With reduplication (Bog, Bog!) Or with an additive (Bog, gdje si ti ste Vi or, literally. "Hello, where are you?" Or "are ... you? ") hand. bog with the lexical meaning "God" appears in religiously shaped greetings syntactically integrated (for example Bog te pozdravi "God greet you!", the farewell Idi sa bogom or contracted for bogom "commanded God!", or Pomoz bog "helping God!" with the possible, but no longer used by educated or bourgeois speakers as greeting [1] reply Bog (ti) daj! "Give it (you) God!"). [2]

something like this
used german wiki and google translator 
-greets,K.P.-