Just like rickrolling except instead of linking to a video you either do it conversations or through text messaging etc. It usually works best when you create an intricate and realistic-sounding story and then ask "and guess what he/she said/did etc.?" When your concerned listener says what, you respond with skeet skeet skeet.
"The other day I was going through the drive-through and you know they normally say please pull up top the next window after you place your order? Well, guess what the lady said?"
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!