It's a temperance song, probably of English origin and has enjoyed life passing itself off, amongst many other things, as an Irish drinking song. A great example of the oral tradition.

I've sung the Wild Rover for many's the year.
I've sung it so often, I'm sick up to here.
But now I have taken vows 20 or more
I never will sing the Wild Rover no more.

No, nay, never...
Will I sing the Wild Rover
No, never, no more

I went to a Folk Club on a fine sunny day,
A chummy little place down ________ way.
I sang out a chorus and felt sort of chuffed.
The audience stood up shouting, "Go and get stuffed."

No, nay, never...

I drew from my set list a song brand spanking new,
No religion or politics and not even blue.
I sang out a chorus. The audience looked surprised.
It was only a folk song in heavy disguise.

It went, "No, nay, never...."

I'll go to St Peter, confess what I've done,
And hope that he'll pardon this song-stealing bum.
And if he'll forgive me and open his door,
I never will sing the Wild Rover no more.

No, nay, never, no more

But we will and enjoy it

HTML line breaks added. (You used "b" where you should have used "br".) --JoeClone, 24-Jun-02.