https://www.youtube.com/watch?v=gG62zay3kck

ROFL! Heck, that's almost gonna be the same in English.

"It was just a minor peccadillo!"

Argle bargle!

Rhubarb! Rhubarb! Custard!

rutabagarutabagarutabagarutabagarutabaga….

These two look very angry!

RhubarbRhubarbRhubarbRhubarb

"TASTES GREAT!"
"LESS FILLING!"

repeat ad infinitum. ;D

And from the movies: https://www.lyricszoo.com/anthony-n.....lechap-chorus/

Mumbo Jumbo

Music and Lyrics by Leslie Bricusse and Anthony Newley

Littlechap begins to campaign, as the Chorus sings:

Vote for Littlechap! Vote for Littlechap!
Vote for Littlechap! Vote for Littlechap!
For Littlechap!

Girl: Fellow citizens, our speaker for tonight is the Opportunist candidate for this constituency, Mr. Littlechap.

Littlechap sings:

Mumbo Jumbo, rhubarb rhubarb
Tickety bubarb yak yak yak
Mumbo jum red white and bluebarb,
Poor Brittania's on her back.

Mumbo Jumbo, rhubarb rhubarb
Nothing newbarb cha cha cha.
Mumbo Jumbo Castro's Cubarb.
I think someone's gone too far!
...
Mumbo Jumbo, rhubarb rhubarb
Up your flubarb, Liberty Hall.
And, dear friends, if I'm elected,
I'm all right, Jack--screw you all!

Littlechap wins the election by a landslide.

The term got started because in the early days of radio, when a radio drama needed the sound of an angry crowd, they would have a group mutter, "rhubarb, rhubarb, rhubarb..."