In the movie Jaws they sing that one song while they're all sitting around the table drinking. I was wondering if there was anymmore to the song and where did it originate?

....Im tired and I want to go to bed, I had a little drink about an hour ago, and it's gone straight to my head.......

....Wherever I may roam, through land or sea or foam...

I'm very sketchy on how it goes, those are the parts I remember.