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(N.) a protein shake wherein milk is substituted with Bailey's liqueur.

Derives from the alcoholic beverage martini.
Jeff: How is Kevin so drunk, yet buff?
Mikal: He's been drinking a lot of Proteinis.

Mrs. Van Waltenberg: Darling, can you get me a martini?
Darling: It's 8am! Here, have this proteini.
by Jay Jay Cool Whip February 28, 2011
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