rhubarb rhubarb

Meanings

1. Background noise of simultaneous conversations, none of which is decipherable since the actors are repeating the word rhubarb or other words with similar attributes.
2. Speech which is undecipherable to the listener because it is in a language he or she does not understand; mumbo jumbo.
3. Blah blah; etc, etc.

Etymology

Chosen as a word for producing indistinct background noise because it contains no very sharp or recognizable phonemes: see rhubarb (“noise”).