Having a very undignified and unruly attitude.
Being a rebel or the "American Badass" type of demeanor.
Having a bear tattoo and being an uncaged animal.
That guy has a huge bear tattoo on him. I wonder if he's unruly and rebellious?
-Oh, fuck yeah he is! That is Bear Johns!
(Example) "I think I'm going to be Bear Johns today. I'm going to be unruly and then go home and stretch my sister's asshole out."