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."