A combination of the words "shit" and "sabbatical." When you have to take a crap and you know it
will take a while and you requires some form of entertainment while doing your business. When going "on shibbatical" one might take a
laptop, telephone, book,
homework assignment, magazine, gameboy, or perhaps a portable television.
"
Hey John O, where are you going with your laptop?"
"Dude, I
ate a shitload of taco
bell earlier, I'm going on shibbatical."