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boner-killer 

One whose features make the erection process fail
boner-killer by jabankyswirl June 7, 2005

boner-killer 

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

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

boner killer. 

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.
boner killer. by Tootsiee Wootsiee October 25, 2011

boner-killer 

Somthing or somonethat kills the fun that you are having
Guy1: Yo Stop screwing around!
Guy2: (to some1 else)Geeze, what a boner killer
boner-killer by Chewing on a spoon September 16, 2005

total boner killer 

A woman who is physically attractive, but totally kills your boner (attraction) due to her negative attitude and lack of intelligence
Hey François that girl I went on a date with last night was a TBK (Total Boner Killer) bro. She was gorgeous until she talked about how much she hated her job."

Bowner Killer 

A "bowner killer" is when you hear something awful or disgusting. Such as when a girl talks about her period, or if you see this incredibly ugly girl. It is also directly known as something that makes you have the opossite of a bowner..
It is also known as BK.
Girl: Today I was bleeding like a waterfall!
Boy: Dude! that was a total BK!(bowner killer)