Same here.

Also as a substitute for the f-word as in the phrase, "Dude, that is like so jacked up."

Also as a substitute for the phrase "fired up" as in, "Dude, I am like so jacked up over this concert."

Absent the explanation for one's jackedness, this phrase references a drug-induced condition involving one of the amphetamines, which themselves are sometimes called "jack" for the effect they have: "Dude, I am like so jacked [up]."

And note the intentional avoidance of any contractions, which seems to be a means of adding emphasis in this (surprisingly long-lived) argot.

"I don't know which is worse: ignorance or apathy. And, frankly, I don't care." - Anonymous