Top Definition
Heard most frequently in US Navy boot camp. Also used by those having just recently completed the aforementioned boot camp.

I. State of being "jacked" or "jacked-up". A word used to describe something that has gone horribly, horribly wrong.

II. A substitute term to describe something as "fucked-up", malfunctioning, or of extremely poor quality.

See also:
FUBAR
Soup Sandwich
"Look at you sorry-ass recruits, runnin' around lookin' like a soup sandwich! JACKNESS!"

"Did you hear Petty Officer call us a soup sandwich? That's JACKNESS, man."

"He had to do push-ups because he was wearing his JACKNESS boots, instead of the ones he had shined-up."
by Kitty McSilver March 26, 2007

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