Hardon; is also when you are running along with your life. Except for when you keep running into; be it boy or girl, who your really hate. So much so that you have a hardon to get either revenge' or give them the ultimate amount of pain and misery. You detest them so much that you got a hardon for them.
Ever since That jerk from work screwed your old lady; You have had one hell of a hardon for them.