Book Thumb 

Book thumb is from holding open a book with your thumb and index finger for long periods of time, causing pain in your thumb muscle.

I've got terrible book thumb from so much reading.

Book Thumb by blueberrypancak September 2, 2013

Big Book Thumper 

1. A member of Alcoholics Anonymous who takes the Spirituality in the brotherhood of AA very seriously.

2. A member of AA who carries the Big Book with him for constant reference.

3. A person overly obsessed with the 12 Steps and 12 Traditions of AA.

1. Bill has been in AA for over 20 years, he has become a Big Book Thumper and quotes from it every chance he gets.

2. Mary was a sponcee of Bill, the Big Book Thumper. She could not do anything without Bill quoting something to her from the AA bible he carried.

Big Book Thumper by JR Harris April 16, 2011