A sound attributed to babies before they learn speech, although they may not actually make these sounds together. Sometimes said to babies as a way of mimicking their sounds.
"He hasn't spoken his first word, yet. All we get is googoo gaa gaa."
by Keith R January 27, 2007
the noise that babies make when they dont have anything else to do
My baby sister said googoo gaa gaa to me last night!
by Pinki June 02, 2006