Alright kiddo, let me explain what a post turtle is. Imagine you are walking along a country road and you see a turtle balancing on top of a fence post. Now, you may ask yourself, how did that turtle get there?
Well, the answer is that someone put it there. This turtle didn't climb up there on its own, it was placed there by someone else.
Now, this term "post turtle" is often used to describe a politician or leader who has been put into a position of power but doesn't really know what they're doing. They're just like that turtle on the fence post, they didn't get there on their own and they're not really supposed to be there.
So, to summarize, a post turtle is basically someone who has been put in a position of power they don't deserve or are not qualified for. It's a way of saying someone is out of their depth, just like a turtle on a post.