‘Platt’ means different things depending on your age. If you’ve just finished Matric, it probably means freedom, rage and parties, and doing the sorts of things that teenagers - who have been worrying about their exams for the last few months but are now free from that stress - do.
If you’re a bit more advanced from those teenage years - that was subtle, right? - it probably means a place to escape, but perhaps differently, getting away to the Garden Route to enjoy the sights and sounds of