Zagreb Slang: What Goes Around Comes Around

Today's Večernji list has a story on the latest generation of youth slang in Zagreb. In the usual Sve je isto, samo njega nema (It's all the same, only Tito isn't here) way of these things, the online commenters are pretty convinced that most of it comes from 1960s Sarajevo, Serbian films' Belgrade slang via Slavonia, and almost anywhere else other than originally from Zagreb.

UPDATE: Thanks Dejan for more on šatrovački back-slang!