In this version by Galway Ramblers, there is a word different from spailpín used in the line:

And I neither will take it from spailpín or brat

It sounds like "slighty." I don't know - maybe the word "sly" with the suffix "ty" added. Any idea what the word is?

There's also a difference in the line:

But says he, "My fine fellows if you will enlist ..."

It sounds like "Might my fellows ..."

Please let me know if you solve either or both of these lyrics mysteries. Thanks so much.