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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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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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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A strong liking towards a member of the same gender, in a non-sexual manner. A closely bonded friendship. Similar to a "bromance."
Ted: "Hey where has Phil been lately? Ah, probably shackin' up with some lass."
Josh: "I really don't know and it's kinda bumming me out. We used to do everything together. It's kinda like Cheech without Chong."
Ted: "Heh sounds like you've got a total brain boner for him!"
by chungamunga April 18, 2009
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Something that strikes a chord in someone's thinking, creating a obsession of "enlightenment" and stimulation in knowledge, and gets obsessed in his/her thought pattern until his / her thought/idea wears off or the thought gets put into action.
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 blue vain brain boner.
by Slim and Gee Production March 30, 2011
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The intense climatic feeling of exhilaration encountered when stimulated beyond arousal of the intellect; a hyper-focused state of mental masturbation.
He / She's got a Brain Boner for it, I can't believe how long he / she's been {watching, reading, listening, etcetera} this.
by Reibesac July 12, 2017
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An idea.
I had a raging brain boner the other day. Space Suits for cats is a good idea, and don't let anyone tell you otherwise.
by earlgreytea23 November 24, 2018
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