goo-goo
Concise Oxford English Dictionary © 2008 Oxford University Press:
goo-goo/ˈɡuːɡuː/
▶adjective informal
- 1 amorously adoring: making goo-goo eyes.
- 2 (of speech or vocal sounds) childish or meaningless.
'goo-goo' also found in these Oxford entries:

