1 definition by dakdak900

Someone who is a member of Alcoholics Anonymous AA and abstaines from the consumption of primarily alcohol and to some to abstain from any mind of mood altering substance including alcohol.

Origin: Bill W. the founder of Alcoholics Anonymous, in social settings this phrase was used to explain why one did not drink alcohol without explicitly stating one's membership in this group which values its anonymity.
Q: Would you like a glass of wine?
A: No thanks, I'm a friend of Bill's.
by dakdak900 October 20, 2013
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