I overheard some of the family singing bawdy songs some nights when they were in their cups. This is to the best of my recollection and I believe there were more verses

In 1492 Columbus he set sail-o
He set sail to Port of Spain to find a piece of tail-o
He knew the world was round-o
And tail-o could be found-o
That scientific, geographic Christopher Columbo

One day on a beach far away
They found a maiden brown
Before the sun had set that day
She earned 10000 crown

They screwed her once, they screwed her twice
They screwed her once too often
They broke the mainspring in her ass
And laid her in her coffin

He knew the world was round-o
And tail-o could be found-o
That scientific, geographic, engineering Christopher Columbo