goo goo ga ga /ˌɡuː ɡuː ˈɡɑː ɡɑː/ exclamation1 •Onomatopoeic imitation of the sound of a baby who has not yet learned to speak.If goo-goo, ga-ga is as foreign to you as a radio broadcast from Ouagadougou, try this definition of “baby talk”: It’s talk directed to your baby, concerning her care. — 2001
