When you find yourself so aroused that your ejaculate (cum) shoots out your penis at such a high velocity that when it hit you you are rendered unconscious.
Matt: "Dude you look like shit"
Jerome: "I was a-ronda-roused so bad last night.....by multiple dudes"
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!