Taken from “Mairzy Doats”, a novelty song composed in 1943, by Milton Drake, Al Hoffman and Jerry Livingston.

Mairzy doats and dozy doats and liddle lamzy divey
A kiddley divey too, Wooden shoe!“

The words sound queer & funny to your ear, a little bit jumbled & jivey, but tranlate to say:

“Mares eat oats and does eat oats and little lambs eat ivy.”
“A kid’ll eat ivy, too, wouldn’t you?”