A good place to start would be this website.I think of more of the rolling of R’s. Or, if your explaining this to a younger person, a machine gun type sound, or a purring type sound. All of these are made by using your uvula.It’s going to take practice anyway you look at it. It is not an easy concept for some people.
One thought on “Flutter tounging”
I like to play whole passages in flutter tongue. Like she said, practice, then try it while articulating. Once you’ve mastered it, you just have to know where to place it.
I always get complements on how they like when I “do that thing”.