he said they don't have the word stop.

OK. I know it's a joke, but why pick on Yugoslavia? So, every language in Europe has the word stop in it because of those international stopsigns. I seem to remember pranksters modifying the letters to read SPQR instead of stop. Speaking of Serbo-Croatian, an American who was visiting a mutual friend in Beograd once asked: "What are all these Pectobahs?" She was reading the Cyrillic for restaurant as though it was in the Latin alphabet.