rhubarb rhubarb

exclamation3

1. •
   (UK) words that actors in a crowd scene repeat together in low voices, to make the sound of many people talking at once with no clear words

   • Those glottals glugged like poured pop, each /rebarbative syllable, remembrancer, raise /‘mob' rhubarb-rhubarb to a tribune's speech /crossing the crackle as the hayracks blaze... — 1981
2. •
   (UK) Speech which is undecipherable to the listener because it is in a language he or she does not understand; mumbo jumbo.

   • ‘Barbarians' who made noises which sounded like ‘rhubarb-rhubarb' to Greeks who could not (and did not want to) understand them. — 1998
3. •
   (UK) words that stand for more talk the speaker does not bother to say because it is boring or easy to guess, like "blah blah"

   • Not allowed to blah blah blah rhubarb rhubarb rhubarb. Just what I don't need when I'm feeling kind of seedy. — 1998