It's
Supercalifragilisticexpialidocious!
Even though the sound of it
Is something quite atrocious
If you say it loud enough
You'll always sound precocious
Supercalifragilisticexpialidocious!

Um diddle diddle diddle um diddle ay
Um diddle diddle diddle um diddle ay
Um diddle diddle diddle um diddle ay
Um diddle diddle diddle um diddle ay

Because I was afraid to speak
When I was just a lad
Me father gave me nose a tweak
And told me I was bad
But then one day I learned a word
That saved me aching nose
The biggest word you ever heard
And this is how it goes

Oh, supercalifragilisticexpialidocious!
Even though the sound of it
Is something quite atrocious
If you say it loud enough
You'll always sound precocious
Supercalifragilisticexpialidocious!

Um diddle diddle diddle um diddle ay
Um diddle diddle diddle um diddle ay
Um diddle diddle diddle um diddle ay
Um diddle diddle diddle um diddle ay
He travelled all around the world
And everywhere he went
He'd use his word and all would say
"There goes a clever gent"
When dukes of Maharaja
Pass the time of day with me
I say me special word
And then they ask me out to tea

Oh, supercalifragilisticexpialidocious!
Even though the sound of it
Is something quite atrocious
If you say it loud enough
You'll always sound precocious
Supercalifragilisticexpialidocious!

Um diddle diddle diddle um diddle ay
Um diddle diddle diddle um diddle ay

Now, you can say it backwards
Which is Dociousaliexpisticfragicalirupus
But that's going a bit too far
Don't you think?
Indubitable

So when the cat has got your tongue
There's no need for dismay
Just summon up this word
And then you've got a lot to say
But better use it carefully
Or it may change your life

For example
Yes?
One night I said it to me girl
And now me girl's my wife!
Ow! And what a lovely thing she is too!

She's supercalifragilisticexpialidocious!
Supercalifragilisticexpialidocious
Supercalifragilisticexpialidocious
Supercalifragilisticexpialidocious!