Quoted from o-din:one of my ancestors was an Indy racing legend.
In your link it listed that their car was a Duesenberg Roamer.
Williams came out with a Doozie in 1968, and it had zipper flippers.
https://www.ipdb.org/showpic.pl?id=704&picno=14504
Duesy is short for Duesenberg.
Many attribute the phrase: It's a Duesy, or It's a Doozie
to mean something positive that is excellent and/or powerful like a Duesenberg automobile.