Here's an even longer version:

All around the cobbler's bench
The monkey chased the weasel
The monkey thought 'twas all in fun
Pop -- goes the weasel!
Johnny's got the whooping cough and
Mary's got the measles
That's the way the money goes
Pop -- goes the weasel!

A penny for a spool of thread
A penny for a needle
That's the way the money goes
Pop -- goes the weasel!
You may try to sew and sew
And never make anything regal
So roll it up and let it go
Pop -- goes the weasel!

A painter would his lover to paint
He stood before the easel
The monkey jumped all over the paint
Pop -- goes the weasel!
When his sweetheart she did laugh
His temper got so lethal
He tore the painting up in half
Pop -- goes the weasel!

My son and I went to the fair
We saw a lot of people
We spent a lot of money there
Pop -- goes the weasel!
I got sick from all the sun
My sonny boy got the measles
Still we had a lot of fun
Pop -- goes the weasel!

I climbed up and down the coast
To find a golden eagle
I climbed the rocks and thought I was close
Pop -- goes the weasel!
But, alas, I lost my way
Saw nothing but a seagull
I tore my pants and killed the day
Pop -- goes the weasel!

I went to the grocery store
I thought a little cheese'll
Be good to catch a mouse on the floor
Pop -- goes the weasel!
But the mouse was very bright
He wasn't a mouse to wheedle
He took the cheese and said "Good night"
Pop -- goes the weasel!

Up and down the City Road
In and out the Eagle
That's the way the money goes
Pop -- goes the weasel!
Half a pound of tuppenny rice
Half a pound of treacle
Mix it up and make it nice
Pop -- goes the weasel!

Every night when I go out
The monkey's on the table
Take a stick and knock it off
Pop -- goes the weasel!
Put some pepper on its nose
And you'll make it sneeze-l
Catch it fast before it snaps --
Pop -- goes the weasel!

A penny for a cotton ball
A penny for a needle
That's the way the money goes
Pop -- goes the weasel!
If you want to buy a pig
Buy a pig with hairs on
Every hair a penny a pair
Pop -- goes the weasel!

All around the cobbler's bench
The monkey chased the weasel
The monkey thought 'twas all in fun
Pop -- goes the weasel!
I've no time to wait and sigh
I've no time to tease-l
Kiss me quick -- I'm off -- goodbye!
Pop -- goes the weasel!