When you hear something that is so profound, brilliant, or novel, that it blows your mind.
Guy 1: "... and thats how the theory of evolution works."
Guy 2: "Holy shit man, I think I just had an intellectual orgasm"
Teacher: "So I was reading through these economics tests last night when I came across Sam's example of a vineyard as one of the best positive externalities. It was so brilliant I had an intellectual orgasm."
A hardo is a person who tries extremely hard at everything. Most times a hardo will try very hard at things that do not require excessive effort. For example, sports practices, gym class, etc.
Wow did you see Jack at practice today? What a hardo!