Copied from a PDF at the website of Stainer & Bell, the publisher of the sheet music:

THE WASSAIL OF FIGGY DUFF
(Michael Flanders)

Oh Christmasse is icum
Mark ye Robin's ruddy tum.
And ye winde itte bloweth very rough, rough, rough,
Now do as ye be tolde
To keepe us from ye colde
And fille us up with Figgy, Figgy Duff, Figgy Duff.

So merrily we sing
For to make ye Welkin ring.
Though of singing we have hadde quite enough, nough, nough.
My maisters if you please
Give us a mouldy cheese
To eat with our Figgy, Figgy Duff, Figgy Duff.

If a cheese ye have not got
Then a groat must be our lot
As we dance round the Mistletoe Buff (Bough) Buff!
If you haven't got a groat
You can go and cut your throat
And ne'er have any Figgy, Figgy
Ne'er have any Figgy, Figgy
Ne'er have any Figgy, Figgy Duff, Figgy Duff!

Traditional words invented by Michael Flanders
©1973 Stainer & Bell Ltd