Any form of literature used to entertain yourself while shitting.
Nothing fights bathroom boredom like a good stack of shitterature.
Literature that one would take to the shitter, hence the term. Sunday funnies, album notes, and yearbooks are all good examples because they tend to distract from the dank smell of your feces. Shitterature usually does not include novels or any other piece of literature that requires concentration.
I didn't bring any shitterature with me so I was trapped reading the shampoo bottles' ingredients.