Definitions by Three years later

brainer 

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.

brainer by Three years later July 17, 2010