Yeah, Jacko was an Aussie Rules football player who broke into acting. He was a rough-head but not too obnoxious, more a larrikin than a troublemaker.
What might be of interest to some here is that although born in Victoria, he started playing football for South Fremantle (a suburb of the Perth satellite city of Fremantle). He was a good footie player and used his fame to get into acting and singing.
Yes, singing. So to experience the full "Jacko" experience, you have to watch the following: -
http://www.youtube.com/watch?v=g0Q5JFHrGNk
If we had to suffer it, so does the rest of the world...