Mark Jackson. Australian Rules football player. The original...Jacko! From a time when it seems as if, all of a sudden, America realized that it hadn't gotten around to assimilating Australian entertainment yet, so it made Paul Hogan a star in Crocodile Dundee, put the name Yahoo Serious on people's lips, and brought us Jacko to yell "Oi!" at us, which was supposed to make us want to buy batteries.