Wanted to keep the definition somewhat loose, individual or intuitive. Precision isn't always a good thing.

Please don't take the words 'subspecies' and 'subculture' as disparaging -- I'm not using them in that way.

Jack Kerouac and Utah Phillips were hobos during parts of their lives. Utah Phillips had a great radio show, and hosted an annual gathering of hobos, which was broadcast around the country. Some of these guys were very intelligent, humorous, and unconventional.

They seem to find ways of living by their wits.

And there is something like a fraternity. Many of them have their own codes and signs, skills, and ways.