What is the origin of the phrase "to go cuckoo"? It seems to have two meanings. In England it usually means to go mad or insane, while in America it seems to be used to mean wildly enthusiastic about something.

Slang adjectival sense of "crazy" is American English, 1918, but noun meaning "stupid person" is recorded by 1580s, perhaps from the bird's unvarying, oft-repeated call. The Old English name was ?eac, cognate with Old Norse gaukr, source of Scottish and northern English gowk, which also has insulting senses. The Germanic words presumably originally were echoic, too, but had drifted in form.