What is "rhubarb rhubarb"

n. 1 (context chiefly British film English) Background noise of several "conversations," none of which is decipherable since all the actors are actually just repeating the word rhubarb, or other words with similar attributes. 2 (context chiefly British pejorative English) Speech which is undecipherable to the listener because it is in a language he or she does not understand; mumbo jumbo. 3 (context chiefly British English) blah#Noun blah#Noun; etc, etc.

Rhubarb rhubarb could refer to:

• the 1980 remake of the 1969 British comedy film starring Eric Sykes, or
• Walla, the filmmaking term for background crowd speech