Okay kiddo, imagine school as a jungle. Now imagine that sometimes there are really difficult students who don't follow the rules and cause trouble in the classroom. That's what people mean when they talk about the "blackboard jungle."
It's like trying to navigate through a jungle with dangerous animals, except in the classroom the dangerous animals are the misbehaving students. Teachers have to be very patient and strong to handle these situations, just like how explorers in the jungle need to be brave and careful.
But you know what? Just like how explorers find hidden treasures in the jungle, teachers can also find joy and fulfillment when they help their students learn and succeed despite the challenges. It can be tough, but it's important work that helps make the world a better place.