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No best answer has yet been selected by mindbullets. Once a best answer has been selected, it will be shown here.
For more on marking an answer as the "Best Answer", please visit our FAQ.I think it much more likely, though, that it is a reference to a part of the anatomy, as I suggested earlier. Lower body-part names - both male and female - are also frequently used to mean a stupid person.
I can see no conceivable connection with the bird of the same name. Cheers