I came across this thread while going over the list I'd made before Tom died of the sources for Curmudgeon's (Tom Hall's) songs. I'm sure he got this one from Oscar Brand. Tom always introduced the song by saying the students at Oxford University were jealous of the lascivious reputation that tinkers' had, so wrote the song to advertise their own erotic ability.

Here it is --

THE STUDENT AND THE DUCHESS

The duchess was a dressing, dressing for the ball
And then she saw the student making water on the wall
With his bloody big dingle dangle swinging proud and free
Never would he stop 'til it was over.
 Chorus:        Hanging down, swinging free
                Never would he stop 'til it was over.

The duchess wrote a letter. In it she did say,
"I'd rather be had by a student than my husband any day.
With your bloody big dingle dangle swinging proud and free."
Never would he stop til it was over.

The student got the letter. He began to shake.
His pants begin to bulge a bit and his bollocks begin to ache
And his bloody big dingle dangle swinging proud and free
Never would he stop 'til it was over.

Well he rode up to the castle. Right up to the hall.
"Lord save us!" cried the chamber maids, "Has he come to do us all?"
And his bloody big dingle dangle kept swinging proud and free
Never would he stop 'til it was over.

Well first he did the duchess, then the maidens, too.
And then he did the butler, what a dirty thing to do.
And his bloody big dingle dangle kept swinging proud and free
Never would he stop 'til it was over.

Well the people came a-running, the rich folk and the poor.
And he mounted them in order gaudeamus igatur.
And his bloody big dingle dangle kept swinging proud and free
Never would he stop 'til it was over.

Well they say he's died and gone below. They say he's down in hell.
But they say he's up the devil and they say he's up him well.
And his bloody big dingle dangle is swinging proud and free
Never would he stop 'til it was over.