From Eye of the Goof:
Long before becoming a derisive term for a minivan, a "Bimbo Box" referred to a marvelous contraption featuring a band of mechanical monkeys, under glass, attached to a jukebox. When you crossed their hairy paws with silver, they churned out a lively Sixties pop tune (Herb Alpert and the Tijuana Brass appears to have been a favorite), and jittered away, more or less in time with the music. A number of these machines can still be found in various German and Dutch cities, and I've seen one here in the US at the Musée Mécanique in San Francisco.
Check out this clip of a bimbo box in action on the streets of Cologne, Germany, and here's a nicely photographed article of a custom-built bimbo box and jukebox from the Netherlands.