I got to this forum looking for Mary's Reply. The lyrics I found posted are new to me. Seems that I'm looking for the funny version which includes this verse:

Your story 'bout Peter O'Laughlin's a lie,
That you even would boast such it near makes me cry.
He has only one stripe while O'Flynn here with me,
Who is better than both of you now has got three.
And a little bird told me if I'm not mistook,
That O'Laughlin's in love with a FAT ENGLISH COOK!
Ach but you and O'Laughlan mean nothing to me
Where the mountains of Mourne sweep down to the sea.

Can anyone add more?

don