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When you are trying to get it in with your girl and one of your friends or siblings just happen to walk in the room and ruin the mood.
Guy: So babe, Whatcha wanna do tonight?

Girl: Well I was thinking maybe we could...

Sibling/Friend: Hey guys hows it going?

Guy: Damn, You Boner Killer
by KingRydah March 16, 2011
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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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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 9, 2013
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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 25, 2006
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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 September 16, 2005
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When watching AMATEUR porn and the male refers to the pledge wipe as a playmate. Jeez I thought this was supposed to be amateur man. What a boner killer.
Isn’t it such a boner killer to not be able to take a female of equal status or better on a date.
by RightTriangle October 7, 2019
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