bathroom reader

A book you take with you to the bathroom, and you do 3 things to it
-read it, - wipe your ass with it,- and flush it

"Hey john, there's no tp in here." "That's ok, I have a bathroom reader in the closet."

Uncle John's Bathroom Reader

A book published by Portable Press, containing random bits of trivia in different categories, ranging from easy read all the way to long read. Little tidbits usually at the bottom of the page or at the end of a topic. There are new books every year, and sometimes there are books in one huge category (e.g. sports), Plunges into... books, and even kids' books. Used to have its own institute and its own website.

Some Dude 1: "Hey, have you ever heard of Armchair Reader?"
Some Dude 2: "Hell no, I've only ever heard of Uncle John's Bathroom Reader."