Another bawdy Lah-di-dah has been sung by The Corries. There was a thread on it whose title I can't remember. This is how it started:

On the 17th of March in La-di-da-di-da
A son was born to Mrs. Da-di dum.
He had two arms, two legs, a mouth, a nose and ears.
And the usual La-di-da-di-da-di-dum.

They duly christened him La-di-da-di-da,
The gave his second name as Da-di-dum.
And throughout his life, and he lived for 90 years,
He was known as La-di-da-di-da-di-dum. (Copied from thread)

Maybe this'll help you to search for the thread. I don't know how to go about it, as the Body search is unavailable. Or maybe someone else remembers the thread title? - Susanne