Okinawan Japanese is like a different way of talking for people who live in Okinawa, which is a place in Japan that is far away from the main island. It's kind of like how some people in America might have a different accent or way of talking depending on where they come from.
So, people in Okinawa still speak Japanese, but they might use different words or pronunciation than people in other parts of Japan. For example, if you wanted to say "hello" in regular Japanese, you would say "konnichiwa." But in Okinawan Japanese, you would say "haisai."
Okinawan Japanese also has some cultural differences that make it unique. For example, they have a traditional dance called "eisa" that is specific to Okinawa. They also have special foods that are different from what you might eat in other parts of Japan, like "goya champuru," which is a dish made with bitter melon.
Overall, Okinawan Japanese is a way of speaking and a culture that is special to the people who live in Okinawa.