Similar to Boner Shock - but rolls off the tongue better - Anything that causes the blood to drain from an erect penis - usually in a most unscrupulous and hurried fashion.
Such as when you're mother walks into your room - with or without your girlfriend involved! OR your girl's old man turns on the porch light just when you were about to make our smooth move... NOT - Boner Wrecker! or when you can't get the condom on fast enough..SO sad... total Boner Wrecker.