Top definition
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.
by JR Harris March 30, 2011
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