Despite having a degree in linguistics, I hadn't a notion before checking dictionary.com just now that "what" had so many different part-of-speech associations! I also didn't know that an interjection was a classification of part-of-speech (a P.O.S. is a noun, verb, adjective, adverb etc). So in this context, "what" is in interjection, I would say.
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Date: 2005-10-26 01:47 pm (UTC)