The act of killing your boner, whether intentional or unintentional, due to unfortunate or untimely circumstances.
Intentional Bonercide: I was getting ready to rub one out and the family came home, had to bonercide! (Thoughts of dead kitties, grandma on the toilet, mom naked)

Unintentional Bonercide: I was about to get in with this chick and she said "those sores aren't contagious". She killed it, bonercide.
by Seximess December 2, 2011
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The natural hormone a released into a man's Penis causing his erection to become flaccid upon glimpsing an ugly female.
Man, Amanda and Shannon are such fucking ugly moles that they destroyed the wood I was sporting with their Bonercide.

Those bitches with their Bebop and Rocksteady Bonercide faces killed my hard on that I was just about to tune up.
by The Macarthur Cockburn May 30, 2013
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