An article over at the Straight Dope brought up a site http://18.104.22.168/.WWW/etymol.html which says that 'boogie-woogie' was used by Southern blacks in the 19th century to mean "secondary syphilis." I can't find this meaning in the OED, nor in RHDAS. Is it in DARE? Where do they get this idea? They also speculate on the origins of Jazz. etc.