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

5 seconds sound clip from the Mary Poppins movie soundboard.

You can hear this line at 00:58:31 in the Blu-ray version of the movie.

Quote context

[...]

- He traveled all around the world, and everywhere he went. He'd use his word and all would say there goes a clever gent.

- When dukes and maharajahs passed the time of day with me, I'd say me special word and then they'd ask me out to tea.

- Oh, supercalifragilisticexpialidocious, even though the sound of it is something quite atrocious. (2)

- If you say it loud enough you'll always sound precocious. (3)

- Supercalifragilisticexpialidocious. (3)

- Um diddle diddle diddle, um diddle ay Um diddle diddle diddle, um diddle ay

- You know, you can say it backwards, which is dociousaliexpiistic-fragilcalirupus.

- But that's going too far, don't you think?

- Indubitably.

- 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 could change your life.

[...]