A Jive Jacker is someone who does something so good, he defines the perfection of his actions by just doing it regularly. He/She "owns" whatever skills and abilities people are watching, mostly in disbelief. It looks like they're cheating somehow, but true "Jive Jackers" never lie, never cheat, and just do it like a god.
"I was watching Michael Philips swim in the Olympics 2008 and in 2012, and that guy is a JiveJacker. Too good, too fast, I'm hoping he ain't a Lance" (Lance Armstrong=cheater). Man, he walked away with the most medals of anyone in history! He's a top notch Jive Jacker."