Stands for "Boner Killer". In the vulgar terms it is literally a boner killer. In other terms it is the act of ruining the moment. Try to avoid being a BK it may lead to others in disappointment or anger.
Sam: Want to watching The Village?
Bill: No that movie's a bk!
Bill: What time do you have to go home?
Sam: My parents want me home at 10.
Bill: What a BK
Bill: Want to go bowling?
Sam: I got to go home. My plant needs watering.
Bill: You're such a bk!
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