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1 definition by Three years later

The satisfaction you get when learning something you didn't know before or to share something else with someone who didn't know about it before. Like a boner, but with your brain.
Mary: John must be the most common name in the world.

John: No, Muhammad is the most common name ever.

Mary: Oh. I didn't know that.

Tommy: Total brainer.
by Three years later July 14, 2010