title and first line of a famous Mother Goose nursery rhyme; nonsensical sentence used to express disbelief (i.e. "yeah right, and the cow jumped over the moon!")
THE COW JUMPED OVER THE MOON
Meaning of THE COW JUMPED OVER THE MOON in English
Explanatory English dictionary bed edition. Толковый словарь английского языка Редакция bed. 2012