When I heard it in the Northeastern US as a kid it was...

When I was young and in my teens
I met a girl from New Orleans.
Her hair was blonde and her eyes were blue
And she let me play with her ring-a-dang-doo.

Ring-a-dang-doo, pray what is that?
Soft and warm like a pussycat.
Hole in the middle, and a little hair too…
That my friends is a ring-a-dang-doo!

To the tune of Blue Tail Fly