What did Yasaburou mean by calling himself a "Bohemian Tanuki"?
I doubt Yasaburou was insinuating that he was from the traditional Czech lands. Instead he meant Bohemianism, which is used to describe people of unconventional lifestyles.

Also see: Urban dictionary, Merriam Webster, Dictionary.com.


a person (as a writer or an artist) living an unconventional life usually in a colony with others
pertaining to or characteristic of the unconventional life of a bohemian.
living a wandering or vagabond life, as a Gypsy.