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
"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" What is the definition of "brain boner"?