“The noise made by a group of actors to give the impression of indistinct background conversation, especially by the random repetition of the word ‘rhubarb’.” – Oxford English Dictionary 

Chosen as the word of the masses in theatre, ‘rhubarb’ is said out loud by those otherwise silent on stage. It is not the language power, but of those who seek to be empowered. A simple word like ‘rhubarb’ can be the French Revolution if voiced by many.