My aunt taught me at Shea Stadium. I’m not sure how to explain how to do this, but I will try.
First, put your index finger & thumb together at the tips, like you’re making a circle with them.
Second, fold your tongue, just the tip, backwards.
Third, put your fingers on the top of your tongue. Fold your lips inward and blow, slowly. Then try building up.
Your breathe should pass between your fingers and make a whistle.
It will take some practice. I know I drove my parents nuts for about 3 weeks. Once I got it, I would do it constantly. Remember, I was only 6.
My whistle is so loud, I can pierce an eardrum from 20 feet away.
Not really, but that’s what my family says. :)

