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1.
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
5430 1829
 
2.
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
112 90
 
3.
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
1 0
 
4.
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
27 199