when the cock sticks out, causing a bulge in the front of a mans jeans. best way to get rid of it is wanking. very embarassng in public. happens often to teenage boys when they see a chic. the erection of the penis. it gets larger, hard, and sticks out.
OMG! i've got a massive hard-on.
everyone saw jay's hard-on in gym yesterday.
by Super hard cock 99 November 27, 2006

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variant of hard-on
I have a huge hardon right now.
He's really got a hardon for that chick.
by pimpassamir August 16, 2004

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An erect penis
Tied naked to the bed, the evil Wicked Wanda gazed down on the captive, Agent Long with an evil smirk, as she fondled and squeezed his gargantuan hard-on.
by barefeet98 November 18, 2008

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When the penis is aroused and expands to it's full length
Kiersten : Mmmmmmmm! Mmmmmmmm!
Chad : Mmmmmmmmm! Mmmmmmmm!
Kiersten : I do love kissing you Chad and it makes you get A Hard On would you like a blowjob?
Chad : Yes Please!
Chad : Ahhhhhhhhhhhhhhhhhh! Ahhhhhhhhhhhhhhhhh! Ahhhhhhhhhhhhhhhh!
Chad : You know this reminds me of the other day when me and Jim were kissing we got Hard On's and took turns sucking each other's dicks!
Kiersten : Reallly I just gave you an amazing blowjob and your going to talk about your gay experience with Jim.
Chad : I'm not gay I'm bicurious!
Kiersten : Well sounds like your gay to me!
Chad : I gotta go Jim want's me to take A shower with him!
Kiersten : GAY!
Chad: Bicurious!
by SlopNChop March 07, 2017

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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?
by pimpassamir August 16, 2004

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1. An erect penis.
2. A contemptible person.
Why you fuckin' hard on!! I'll fuckin' Carlton Fisk ya fuckin' head with a Lousiville fuckin' sluggah!!
by Qbert July 30, 2004

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1. a erection of the penis

2. a stubborn and severe person
His hard-on drew unwanted attention from his students.
by The Return of Light Joker May 21, 2009

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