Quote from MandelbrotSet:
Chuck Norris took one look at SCT, laughed ... pulled out his gun and blew jack hershey away.
This is the first known jack-attack to have happened in the history of trading ... but many more have followed since then.
Jack-attack corrupted to "Jacked"
This is a phrase largely equivilent to fucked up or screwed up. It roughly means "in a state of disarray" and is commonly used in the phrase "SCT is jacked".