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An easy decision made using the brain. As opposed to a 'no brainer', an incorrect term seeing as how all decisions are made using the brain, as pointed out by SourceFed's brilliant Joe Bereta.
"I could save that man's life with a simple marrow donation, it was a brainer."
by anIrishViking April 24, 2013
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A Brainer is when you do something because it had to be done and you knew it was the right thing to do.
Brainer
1.You gave that guy some of your bone marrow well that's a brainer.
by WolfBrother13le April 24, 2013
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when you're excited to learn something new, eg. math, science. it's basically a boner in your brain a.ka brainer.
professor farnsworth: all of this knowledge is giving me a raging brainer!!!
by soma689 April 25, 2013
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