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1.
Three simple words to describe a moment of confusion. Can also be used as a phrase in itself to "Break the Ice" or end the silence of an akward comment. Sometimes expressed as a mood.
Dude- "Hey Mike, what did Bronson say?"
Other Dude-"I dunno something like...Rada rada rada..."
by CoOoLCaT5 November 19, 2009
 
2.
The noise made by a person (usually female) when bitching, being an annoying bitch, or complaining. Expressed after observation by the second party in response or interuption.
Sally: "You told me you'd take out the trash! And last wenesday when we were supposed to go to Betty's..."

Fred: "- RADA RADA RADA!"
by Jeanniee g March 23, 2010