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In the US, the word 'fanny' refers to the 'rear end'.
Oh, and I've always figured that pants was considered plural because it ends in 's'. I know that's not a very good rule, though, because there are plenty of exceptions (There's a good English rule!). I just haven't been able to think of a better reason! Edited 2008-05-08 15:44 UTC
Not only does "fanny" mean "rear end" in the US, but it's considered a very innocuous, and even childish word. It's also antiquated, and not in wide use anymore, which should come as a relief to horrified Brits.
This is why it is all the more important for us in the US to bring about the demise of the fanny pack!