It's on an album called "Travellin'People" with PD and Margaret Barry. Can't help you with the tune but here are the words, written by Pecker Dunne. There's a pic of Pecker, under 'banjo' in Companion to Irish Traditional Music, edited by Fintan Vallely, Cork University Press, 1999.

PORTLAOISE JAIL

Oh! For thurty [sic] years I've been a tinker,
I've tramped the mountains and the glen,
I've courted girls in every county,
And I fought the very best of men,
I drank an awful lot of porter,
I've slept in sun and snow and gale,
But the life I loved was taken from me,
When is pent two years in Portlaoise Jail.

Chorus
Portlaoise Jail would tame a tiger, try me boys and do get bail,
There's many a heart that sobs and sighs, inside the walls of P.J.

I joined a camp outside Killorglin,
The night before they crowned the King,
There was song and dance and plenty porter,
With our wagons formed around in a ring,
Till a foxy lass sat down beside me,
Bedad, says I, I'm alright here,
But her husband roared and leapt between us,
And he knocked me down with a kick in the ear,
I hit him hard below the navel,
He hit the ground with a mighty wail,
His neck was broke, he died in seconds,
And I spent Puck Fair in Portlaoise Jail.

Chorus.