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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When you're attracted to somebody primarily based on their personality and mind rather than appearance (although that does help).
"That thing you just said was so cute. I have an erection for you, but in my mind. I have a brainer."
by bobplate May 05, 2014

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A word used by senior stagiaires who are trying to look cool. While the validity of the word is contested, it is accepted that the word is not used by anyone anymore, or at least anyone who you would consider to be cool.
Christine: This guy I know went did a degree in engineering and a masters in engineering and now he is in med school doing his residency, what a brainer!

Mat: What's a brainer?
by trusted authority November 18, 2011

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Old trainers, where the front has worn down giving the appearance of a throbbing brain.
Haha check out his brainers!
by Lewis1983 May 30, 2005

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Not a no-brainer.
His video timer is such a brainer that he is leaving it flashing at 12:00 AM.
by Milt Alwin March 19, 2009

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Somone who is smart funny and fun to be around and used to trick people to think ur talking bout giving head
man i love to be around that girl shes a brainer
by gtman43 April 01, 2010

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A brainer in when a person inhales marijuana smoke through their nose, sending it straight to the brain.
"Hey man, you wanna toke?"

"No, I'll just take a quick brainer!"
by Kanuckilish March 10, 2009

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