Anything associated with severe pain, agony, or ruin.
1. Early in his career, Mike Tyson frequently handed out shitjackets to opposing fighters.
2. Drinking that bottle of Crown Royal was not wise. It put a shitjacket on my stomach.
3. Getting fired for sexual harassment will put a shitjacket on your prospects of finding another good job.
4. Ric Flair would put opponents in a shitjacket via the figure-four leg lock.