Imam poslovni sastanak means “I have a business appointment” – your answer when customs ask what you are planning to do in Croatia.
You and your mum are meeting a man from Slovakia in the next town who has a job going for your niece: mum gives you imam, and job, Slovakia and niece give you poslovni. The last time you met him he was sitting there stark naked – an image that is hard to forget, and that is exactly sastanak.
The three words are long, but the story runs in a straight line. Say it once in German before you attempt the Croatian sentence.