Here are the words - I'll have to work out the tune and post that later.

SANTA'S LOST HIS TROUSERS

Up in the wastes of the frozen North in the land of the Eskimo,
Where hot dogs sell a million but ice cream sellers never go.
There's nothing much to see up there, however much you roam,
But that's the place that our dear Santa chose to make his home.

On the night of December 24th it's very busy he's kept.
For he'd been working all that day and soundly now he slept.
And it took the cry of his reindeer to awaken him in time.
But as he jumped into his suit he realised the awful crime (the awful crime).

Chorus:
Oh Santa's lost his trousers, someone's pinched them off the line,
Give them back for his sake, he's running out of time.
If the kids don't get their parcels and their ginger beer,
Poor Santa will be on the dole when Christmas comes next year.

He said, "I knew that this would happen, Christmas Eve has been such bliss.
I guess there's nothing for it, I'll just have to go like this!"
And his faithful reindeer Rudolph had to agree with that,
But Santa couldn't quite decide just where to wear his hat (to wear his hat).

Chorus

With knocking knees and a frozen rear he sailed through the air.
Old ladies taking dogs for walks just had to stop and stare.
Some they fainted on the spot, couldn't believe their eyes.
At the sight of Santa's glowing cheeks a flying through the skies (a through the skies).

Chorus X 2