In 'Silence of the Lambs' why is Miggs nicknamed 'Multiple Miggs'?

An incredibly creepy character, from a psychological point of view he is one of the scariest people in the film, the scariest is, obviously, Anthony Hopkins as Hannibal Lecter, the best performance I have ever seen. And by the way: "I bit my wrists so I would die, look at the blood!"
Update: At first I thought it would be the name of his mental illness but the only illness I know with 'Multiple' in it is Multiple Sclerosis, I don't think that would be a serial killers condition, not sure though!
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