when the blood from your brain goes to your penis when you see a hot girl.
*coming out of a swimming pool* oh crap I have a boner! *shows through your shorts* dammit!!!
by TheNomster November 09, 2011

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So you're in 8th period english
And the girl behind you is a DD
And you keep staring at her
And you're like
"Wow. I'd like to do that."
You mind sends stimulation to your crotch
And increases the blood flow
And it's another word for erection.
oh damn look at leslie. i'm getting a boner
by lala2341 May 29, 2011

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When your cock goes really hard.
Child: Daddy, what is sticking out of your pants?
Dad: Oh, that's a boner.
by Fabio Fobbs February 05, 2012

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a special kind of bone that only appears on special occasions, and only special ladies can make it appear.
Jay's boner recognizes Annie before his brain does.
by mademoisellevanta March 21, 2015

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When a guys dick is happy
"Man your boner is happy!"
by VastKilla February 06, 2015

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When u see somebody hot and ur penis gets stiff
Bob got a huge boner when he went to the strip club
by ThatOneGuy6109 May 25, 2014

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A slang, band term for a trombone. Usually followed by the phrase "Can you blow my boner?" or rather.
"What do you play in the band?"
"Oh, the boner"
"Can I blow it?"
"No, me first"
by inufan_7 September 07, 2008

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