What's a "pumpking"?

I've never been on p5p, or in any of the other places that the
word "pumpking" was used.  From context, I have a vague idea of
what the word means, but what is its specific definition?

Thanks in advance.

-- 
Matthew Cline        | Suppose you were an idiot.  And suppose that
[email protected] | you were a member of Congress.  But I repeat
                     | myself.  -- Mark Twain