The version I know goes as follows

It was Xmas day in the workhouse - The season of good cheer
The paupers were all merry - Their bellies full of beer

Then strode the workhouse master - Into those noble halls
Wishing them a merry Xmas - and the paupers all answered balls

Well this angered the workhouse master - and he swore by all the gods
That he'd stop their Xmas pudding - the rotten ungrateful sod's

Then up spake a bald headed pauper - He had a voice as bold as brass
You can take your Xmas pudding - and stick it up your arse.

It can be sung with great effect to the New Orleans Jazz tune St James Infirmary Blues.