You know, I've listened to that song on a tape for years, and never really worried about those words. I'm pretty sure the first word is "mollygrubs" and I think the second is "burstin'" which I assume is Irish for "fuzzy mouth" or "dry" or some such.
Blessings,
Barbara
PS, you get more answers faster if you put the name of the song in the Header, like "Heard of St. Patrick". Welcome to Mudcat!