This must be the best example of attempts to rationalise what was at one point in its evolution a complete nonsense chorus.

Here's one example of an older version with complete nonsense refrains as it stands.

Now nature orderd as you were
Lingdum bullidum a Koyme
And we won't have tadpoles covered in fur
Lingdum bullidum a Koyme

Koymanero kilkil kero
Koymanero koyme
Plim-slim slammadiddle
I'm a bulla ringtum,
Lingdum bullidum a koyme.