Origin of goo
How to use goo in a sentence
So Gg.; rest The goos, the duk, and the cukkowe also (wrongly; see next line).Chaucer's Works, Volume 1 (of 7) -- Romaunt of the Rose; Minor Poems|Geoffrey Chaucer
"Yes, and it's sure fun fighting those brown-skinned little Filipino goo-goos," grunted the older soldier.Uncle Sam's Boys as Sergeants|H. Irving Hancock
The goo-goos are not hitting any of us, and we're not losing anything by saving our ammunition.
From this the soldiers have learned to allude to all fighting Filipinos as goo-goos.
I'll be glad to, Sarge, for I'll admit that I'm anxious to know what the goo-goos are doing.