Hey Ken, Welcome.
I've never heard of this but I've done a wee google.
It seems to refer to spurs - the _link_s below think it refers to the bass drum spurs [?] perhaps it is cowboy spurs with the sound of the wee wheel being spun - maybe that's just silly :)
http://forum.classicalarchives.com/messages/2/6725.html?1129630800http://en.allexperts.com/q/Classical-Music-2272/Der-Zigeunerbaron-percussion-instruments.htmYou're seemingly not the first to ask this question about this piece, sorry I'm no more help
Paul