What occurs when blood rushes to the penis, causing it to stick up. it is also possibly the worst thing to get before a school presentation.
While I was in a school play, I got a boner.
by Sapphire Flames February 15, 2011

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Boner means an erected pennis.
It's called like that because it reminds a bone when it's hard.
John was watching to much porn in his computer, so he got a boner.
by Urban Dictionary September 30, 2007

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You penis's version of a thumbs up.
*3 very sexy girls in one room*
Mark:My boner is telling me that all of them are a good choice.
by Jon200105 February 25, 2013

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When your wiener gets hard due to the rushing of blood into it. Happens usually when you are horny. Or when you first wake up in the morning.
The boy got a boner from watching porn
by buuuddy March 30, 2011

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A "boner" is when men get erections when they see hot and busty women, and when they think about erotic thoughts.
Dude, I had a mean boner last night, I squirted cum all of my girlfriends face. Then she begged for more.
by Cousin Joe August 25, 2007

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Erection of the genitals from excitement or pleasure.
Timmy got a boner when he saw Becky swimming naked in her backyard.
by Frat Guy 2009 May 06, 2013

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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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The Urban Dictionary T-Shirt

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