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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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Jun 14 Word of the Day
Referring to women who are sexually or romantically attracted to other women. Applies to both lesbians and bisexual women, as it is only the same-sex attraction that matters, not any other attractions the women may have.

Originates from the Greek poet Sappho, a bisexual woman from the Isle of Lesbos, from which we get the term lesbian.
The sapphic women greatly enjoyed each others company.
by whatisdead June 25, 2015
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2
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 April 28, 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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When you are talking and then have a random smart moment.
"Your mom just had a brain boner about robotics"
by Expression of happiness July 22, 2014
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5
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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6
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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