I was in Newfoundland a couple years ago, and "Ise de B'y" seemed to be the number-one song for entertaining tourists. (I'm not correcting you spelling, by the way--just illustrating the variety.) Until I read your note, I had no idea it was Irish. Anyway, I'm seconding the motion to get it in the DT. Unfortunately, I can't help. Well, here's the first line, to start everybody off:

"I's de b'y dat bails de boat, and I's de b'y dat sails her."

I guess the point of this note is that you might try looking all over for this one in collections of Newfoundland folk songs as well as Irish.