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On a male, the physical effect of being aroused at the thought of extinguishing a human life.
An old lady crossed the street in front of my car and I got a murderboner at the thought of flooring it.
by Danny Valentine December 11, 2010
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Etymology of the word Murderboner: The name dates back to circa 800 AD when hoards of Vikings pillaged new lands. Observers of Viking raids told huge erections achieved by the warriors after killing a victim.

Alternative meaning: what your dick looks like after having sex with a girl on her period.
As he pulls out... he looks down and sees blood, SHIT Murder boner.
by Tonto_89 September 18, 2016
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When you're jonesing to see a gruesome death on film, you can be said to have a murder-boner.
"What do you wanna watch? I have such a murder-boner."
"Silence of the Lambs always cures my murder-boner."
by Seeing Double November 10, 2013
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