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A person/thing who kills the mood when everything is going great.
Think of a situation going your way when a person just ruins it in the worst possible way. You then go, "Why do you have to be such a bonerkiller?"
by Mike_17 November 28, 2007
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8
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 February 28, 2011
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9
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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10
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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11
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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12
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 07, 2019
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13
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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