A recovering alcoholic, especially one who is a member of the organization Alcoholics Anonymous.
He was a friend of Bill W. and had just celebrated Ten Years of Sobriety.
Example Bank
6
01
W rizz.
Wiktionary
02
This was supposed 2 be a SURPRISE, but the girls got it out of me. ☺ I wanted all of us 2 spend Xmas 2gether. By all, I mean r horses 2. Sooo . . . B, C, G, Z, & D, you have guests waiting @ BC. Zane,
Wiktionary
03
When Sharon took the Enneagram test, she came out as a 3w2.
Wiktionary
04
From the Kierkegaard Room he lopingly careened through a red-carpeted hallway that had previously vouchsafed him a comfort station but this morning seemed all business, no M or W in sight, just salons
Wiktionary
05
You say that like it's not an absolute W.
Wiktionary
06
You, sir, are a W man.
Wiktionary
Usage Notes
i Register
In some senses, w is marked as slang, informal, US. Watch for register when choosing this word.