1. A dissident or loner; somebody who has distanced himself from his grassroot origins and roams the world without being tied to a distict group, ideology or belief system.
2. A traveller, pirate, outlaw or scoundrel who relies solely on his own set of rules for survival.
Famous examples would include Captain Nemo, Elric of Melniboné, Long John Silver, Dr. Richard Kimble, Kwai Chang Caine, Drizzt Do'Urden and John Dillinger.
"He confronted his family about what they had done and went freejack."
"Beware of Jason, he's some kinda freejack."
"Told ya Shirley, that's what you get when you fall for a freejack."
When someone leaves their Facebook account logged in or shares their login details with someone else at which point someone makes posts to said person's account without their knowledge.
"Bill just got facejacked. That guy gave me his login credentials for Facebook so I wrote on his wall and updated his status."