1. One of the bony, permanent, hollow paired growths, often curved and pointed, that project from the upper part of the head of certain mammals, as cattle, sheep, goats, or antelopes.

2. A synonym for penis, named after the similarities to the first definition. Both are hard, permanent, curved and pointed.

3. An instrument for making a noticeable sound, often used on vehicles such as cars, motorcycles, bicycles, etc.

4. A trumpet.

5. A symbol of power or strength.
Bob: "I saw his huge animal with horns on the road, so I instinctively honked on the horn while putting some pressure on the breaks. I stopped a few inches short of it--the bastard didn't move the whole time--and hopped out to lecture it on road safety. It looked so cute that I whipped out my horn and began making anal love to it, while I belched out some notes from a horn I always carry around with me--yeah, I'm kinky like dat!

Jim: Dude... you are the greatest horn in history!

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Verb: to have sex with another man's girlfriend.
I horned your girlfriend last night, Jeff.
by BigDaddyCavs February 16, 2011

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a long glass tube, sold in inner city bodegas to smoke crack
yo son, i just copped a hit, but i don't have a horn to smoke it in
by zany Zane September 17, 2007

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Horny: to be sexually aroused to the point that you're desperate. Wanting to get some real bad. "Horn" is used as prefix to words, such as dog.
That guy is such a horn-dog.. he is desperate for a girl.
by pnksktlz September 20, 2003

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Nobody has used this definition yet.

A horn is a musical instrument used in many classical compositions. It's known for its beautiful sound. Commonly used in fanfare. Sounds intense when there is at least 4 of them. Also known as the "French" Horn, though it did not originate from France. Type French Horn in on YouTube.

Also known as a slang word for penis.
"Did you hear the horns in the Olympic theme? Amazing."

"Time to toot my horn!"
by 3749510784781 July 27, 2007

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a woman who is not currently being a hormeister. A woman who is treating her boyfriend or husband in a good natured way.
Thanks for being a good horn today. I can't stand it when you are a hornmeister and treat me so cruelly.
by Stew Sobel October 22, 2006

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Slang for beer.

First used by Kizuel on the Madoshi message board.
I'm on my second horn.
by Kizuel April 04, 2005

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