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Someone you are drinking beer with. Someone who goes out for drinks with you.
Not necessarily a close friend but is present during a drink with you.
A drinking buddy:
some one who is almost always there when you drink.
From A West Texas Soapbox:
My best drinking buddy, Mike Cronin, laughed and said that Sanderson had the aesthetic of a plumber.
The expression has been used from the '50s (Ngram)
Required, but never shown