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1.
Boner Breaker Is a term used for certain images, people, or objects that ceases a man's erection. Often said as, 'B-b-boner breaker!'
Chris: This erection is so good!

Simon: Margaret Thatcher naked..

Chris: Eugh! What?! My erection! It's gone!

Simon: B-b-b-boner breaker!
by Ferrik August 08, 2008
 
2.
1. An action or event that totally kills your boner.
2. Also used as an adjective in the place of a word like grenade.
1. John: Did you bone Carrie last night?
Jack: No dude! Her mom walked in and it was a total boner breaker!

1. James: FML! The Netherlands lost the World Cup!
Jason: Total boner breaker!

2. John: Hey, Allie is lookin' pretty cute dude.
Jack: No way bro! Allie is a total boner breaker! You must be drunk dude.
by Martin Stekelenberg January 23, 2011