Thank you guys !!
I was searching to know if "musha ring durum da" was gaelic, and i've found much more. Now this song remains however a knaves song. Last time I heard it, it was sung in the street of the little village Tubbercurry, co.Sligo, by a group of drunken youngs, under the rain and long after pubs had closed, just before police arrived and sent us home. Nasty song, for nasty people.