Okay kiddo, imagine you have a secret code with your friends. This code has rules on how you should treat each other to be good friends. That's what bro code is!
It tells guys how they should behave with their friends, especially when it comes to girls. For example, if your friend likes a girl, then you don't try to go out with her. That's not nice, and it could hurt your friendship.
Also, if you accidentally see a bro doing something embarrassing, you don't tell anyone else. It's like a secret between you and your friend. Bro code also tells you to always have your friend's back and defend him when someone is being mean to him.
It's important to follow the bro code because it helps build strong friendships and trust. Just like you have rules for your games, bro code has rules for being a good friend.