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.