My uncle used to sing this 50 years ago. It went something this:

As Saint Kevin once was wandering round the lakes called (Glendalock?)
He Met with King O'Toole and he asked him for a shock
Said the King "You are a stranger
And your face I've never seen
But if you have a bit of weed,
I'll lend you my dodeen Does this come close enough to ring any bells? ... Edmund