Sideshow Bob: Ah, for the days when aviation was a gentleman's pursuit back before every Joe sweat sock could wedge himself behind a lunch tray and jet off to Raleigh-Durham.
Now, Sideshow Bob is someone who would be inclined to use vocabulary somewhat off the beaten path.
It sounds rare to me, too. It could be a near obsolete one.
But I can give you a Simpsons quote right away. See:
http://simpsons.wikia.com/wiki/Sideshow_Bob%27s_Last_Gleaming/Quotes
Now, Sideshow Bob is someone who would be inclined to use vocabulary somewhat off the beaten path.