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."