I don't know what a "zump" is.
I came up with the word "zump" in 2001 as a deliberately meaningless but short word I could use for a domain name that doesn't stand for anything or imply anything. It has stood the test of 16 years meaninglessness so far.
Periodically I like to look up the word and find out what it might mean.
At one time zump.com was a Portuguese portal site so I thought it might be a Portuguese word; but maybe not. For a while I feared it had become a vaguely rude slang word. Now it seems there is a Swedish cosmetic company using the name.
My favourite result, and the one which has been around longest, is a paper plane. This web page has been sitting around, unchanged as far as I can tell, since at least 2001.
The old typewriter picture came with the default Bolt installation. I like it so it's still there. Perhaps someone will mistake it for a zump.