Heard a man sing this song over the weekend but can't find the lyrics anywhere.
The chorus went:

May the snails devour his corpse
And the rains do harm and worse
May the devil sweep the hairy creature soon
He's as greedy as a sow
As the crows behind the plough
He's the black man from the mountain Shauneen Roo

I found reference to the chorus on the net but can't find the full song.