When you intend to murder someone, but end up boning them instead.

(Inspired by events from the end of Dexter S07E06)
"Wow, I can't believe Dexter just murderboned Hanna."

"Yeah, that's a classic murderbone."
by DoktorZaius November 6, 2012
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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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