An individual who can actually reverse an erection. Someone sexually unattractive.

See also hard off
Oprah Winfrey is a boner-killer
by robin graves February 21, 2004

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A term used to express disappointment or to define something as disappointing.
Dude, I think your crush likes someone else.
Well. That's a boner killer.

*after breaking your laptop*
AGHHHHHHHHH. Boner killer!
by X3no June 09, 2013

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an ugly/unattractive girl or guy. can be shortened too BK.
Jack: oh maaan, she's soo hot.
Liam: dude snap out of it.. such a boner killer.
by Tootsiee Wootsiee October 25, 2011

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Somthing or somonethat kills the fun that you are having
Guy1: Yo Stop screwing around!
Guy2: (to some1 else)Geeze, what a boner killer
by Chewing on a spoon August 23, 2005

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When your boner is pretty much killed. Can happen is a lot of ways, some girls are pro also kown as a BK
Holly- "I'm going home"
Matt- "WHAT A FUCKING BK (boner killer)! Wel, have fun flicking your bean bitch"
by jermy September 21, 2006

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The Urban Dictionary T-Shirt

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