I just did a Google search for Four and Nine, but I see this thread has been going on for years. Well, I also had an uncle who sang it, and all my brothers, my cousins, and now our children know all or part of it. My uncle's version, as far as I remember it, was a combination of a lot of what has already been written here, but there's also a lot more. Still, I suspect that there's parts that are missing because I don't remember them fully:

I met a girl going West one night,
She had a great big appetite.
She asked me to take her out to dine,
But all I had was four and nine.

Four and nine, I took her to the Cecil,
Four and nine, we didn't go inside,
Took her to Lockarts and ordered wine,
Bang went threepence out me four and nine.

She started off with oxtail soup,
Then ordered eels and looped the loop.
Gee, she said, this dinner's fine,
And I started rattling me four and nine.

Four and nine, the waiter brought the bill in,
Four and nine--twenty seven bob.
She had a pain from her food and wine,
And I had a pain from me four and nine.

In came the boss with a great big stare,
Placed his boot where I wouldn't say where,
Out of the window I did fly,
And landed on the pavement with me four and nine.

Four and nine, listen to this moral,
Four and nine, take a tip from me,
Never take a girl out west to done,
If all you have is four and nine.