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when a guy sees something he finds sexually stimulating and makes his penis become hard and he wants to fuck whatever it is
Jack: Yo you got a boner dude!

John: I know. That watermelon over there is pretty sexy
Jack: ...
by Marley :) June 24, 2017
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*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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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 16, 2011
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When a guys dick is happy
"Man your boner is happy!"
by VastKilla February 7, 2015
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A hardening of the penis when secually aroused, if this occurs u must stick it in a vagina until it sneezes out milk
by Hortonhearskeem March 1, 2017
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Erect penis that happens when a male is sexually excited/stimulated. When blood flow rushes to it and causes it to stick up directly!
Kade has got a boner. Look at him!
by loverb0yy April 15, 2021
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