"Bloody Great Kidney Wiper" with its immortal chorus:

With his bloody great kidney wiper,
Yes, bloody great kidney-wee,
And forty yards of foreskin
Hanging down below his knee!

"Balls as Heavy as Lead" is another classic in danger of becoming extinct, the chorus of which runs:

For they were large balls,
Balls as heavy as lead,
With a dextrous twist of his muscular wrist
He'd sling 'em right over his head!
For they were large balls,
Balls as heavy as lead!

Cheerily,
Charley Noble