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Something that strikes a chord in someone's thinking, creating a spur of "enlightenment" and stimulation in knowledge, especially in subjects like philosophy & logic.
John: Hey, have you seen that recent philosophical discussion between XXX and YYY on YouTube?

Peter: Yeah, it was so good it gave me a brain boner.
by nullswitch February 20, 2011
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Something that strikes a chord in someone's thinking, creating a spur of "enlightenment" and stimulation in knowledge, especially in subjects like philosophy & logic.
John: Hey, have you seen that recent philosophical discussion between XXX and YYY on YouTube?

Peter: Yeah, it was so good it gave me a brain boner.
by nullswitch February 20, 2011
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The feeling you get when you are having a lively discussion or listening to an engaging lecture and everything makes sense and it gives you a bunch of new ideas about the topic at hand. The intellectual equivalent of an erection.
DeSean: oh man, that lecture given by Dr. Kobilka about G protein-coupled receptor dynamics gave me a massive brain boner.

Derrick: uhh...right, yeah, totally dude. *pssst* Jimmy, I think we need to re-evaluate our friendship with DeSean...

Jimmy: agreed.
by Longrod Von Hugedong May 26, 2016
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When you are so intellectually stimulated your brain gets a boner.
You: Did you guys check out my new 3D TV?

Me: Yeah, major brain boner.

Used when describing something that intellectually "turned" you on.
by The Comet March 10, 2011
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Sexual arousal that comes from enjoying someone else intelligence.
Guy1: Have you seen that girl? She is incredibly intelligent.
Guy2: Yeah, I would go over an horde of blood thirsty aliens to have her. I have an incredible Brain Boner.

Girl1: I can' t belive the way he explained Heisenber uncertainty principle.
Girl2: Yeah, he gave me a Brain Boner since the start of the class.
by Dolapevich January 17, 2014
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just like real ones, they can be given or received.
Tauni gave me a huge brain boner this afternoon.
by TauntaunandJ January 19, 2018
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