What is the poem/shanty “My Jolly Sailor Bold” about?

[A1r2i3e4l5]

Okay I know it was in the latest Pirates of the Caribbean movie but I've been so obsessed with the poem and I've always wondered what the poem is about? Not the origins just what the actual poem is about. You can find it at these websites:
http://jsbookreader.b...sailor-bold-1891.html
http://dontcallmenymp.../my-jolly-sailor-bold
https://plus.google.c...146/posts/6gGE6UuJGfa
http://books.google.c...sailor%20bold&f=false

[boxtops]

I think it's just about a well to do young lady, musing about her lover who's at sea http://jsbookreader.b...sailor-bold-1891.html

[heathfield]

Hardly well-to-do...she's left home and so lost the £3000 allowance her father was giving her! The words of the poem make its meaning clear enough. What don't you understand?