Being a rebel or the "American Badass" type of demeanor.
Having a bear tattoo and being an uncaged animal.
-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."
"Dude, the night was going well until we went back to his room and I saw the teddy bear on his bed. After that I totally had to bounce, I can't end up with a bear john on my hands!"