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(alternate spelling of hardon)
1. An erection
2. A problem
Although definition 1 is far more common, 2 is occasionally used. It is used with "for", as in "Having a hard-on for..." It implies an unhealthy fixation, and it is pejorative, in that (obviously) it implies a homoerotic obsession.
Ever since I got Jim fired, he's had a real hard-on for me.
Stop picking on him! Why do you have such a hard-on for him anyway, dude?
hard-on by ThisIsAmir August 16, 2004
1. a erection of the penis

2. a stubborn and severe person
His hard-on drew unwanted attention from his students.
when a penis grows bigger and hardens.
The man was fucking the girl on the floor, and then his penis had a hardon, and the girl licked it all day long
hard-on by Thrashmeister November 10, 2004
A term for having a boner, erection or ummmm i cant think of any more words....
Jenna Jameson: Oh Alexander you have such a BIG hard-on!, it can barely do down my throte!!!!!!!!!!
Hard-On by Vanilla_Ice January 26, 2005
A term used by men over the age of 65, describing an erect penis or choad. One may note that whenever "hard'on" is used, the sentance automatically becomes hilarious, and one must then give these over the hill bed rockers props
That there boy has a hard'on!
Hard'on by Mark LaFrance March 3, 2005
"I better get out of here. If Joe sees us talking he might get a hard-on."
hard-on by Steve Jobber November 2, 2007