A person who knows a lot about beer, particularly a certain kind of beer. Often also a connoisseur.
Steve: Dude! Bob just told me how many calories, grams of fat, and percent daily value of vitamin D that a bottle of Dos Equis has, without even looking at the label!
John: What a Dos Equis-pert!
by a Dos Equis-pert June 26, 2011

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