Sure, let me explain what "okie" means in a way that a 5-year-old can understand.
Sometimes people say "okie" instead of "okay." It's a shorter way of saying the same thing. It's like when you say "bye-bye" instead of just "bye." It means that someone agrees or understands what someone else is saying or asking.
For example, if your mom asks you "Would you like some ice cream?" and you say "okie," that means you're saying "Yes, I would like some ice cream."
So, "okie" is just a different way of saying "okay" and it means that you agree or understand something.