I've always been fond of paraskavedekatriaphobia. Everyone and his dog knows triskaidekaphobia, but paraskavedekatriaphobia is delightfully specific.
I also like borborygmi, because it's simultaneously a "big word" and pretty much an onomatopoeia. A quick check of Wikipedia says that the Greeks probably coined the word for the onomatopoeia aspect, and that's good enough for me.
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