What does "ZZ Top" mean?

There must be SOME reason for the name, isn’t there? I’ve never found any info on it.

From http://www.cse.iitb.ernet.in:8000/proxy/everest/~ash/rock.htm :

The first thing I would have thought of was “Top” cigarette papers, actually.

I don’t know why anyone would think that the band’s name has anything to do with rolling papers.

Unless it might have something to do with this.