Hooroo

The "truly wondrous fantasmagorically splendiferously magickal word hooroo" (credited to someone's Uncle Wally) echoes two likely sources. It's a bit of a joyous exclamation, as in "Hooroo! hooroo! hooray!" (Darby O'Gill), and it's also something of an owl's hoot, as in "the proper hooroo, hooroo" (The Sword in the Stone).