The process of checking one's Facebook whilst on the toilet. A modern phenomenon, due to the ease of smart phones. Closely related to Pissbooking (by about ten centimetres).
After that dodgy curry, I knew I was in for a big one. So I decided to do some Shitbooking.
-"Dude, you were in there for ages, you alright?"
-"Yeah man, just did some Shitbooking"