Top Definition
A bad or painful movement/rub on the penis that can cause you to lose your erection, or just get you out of the mood for masturbation/blowjob. Named for the famous Batman comic, "The Killing Joke."
Guy: Oh, god dammit, that hurt!
Girl: Sorry, honey, it won't happen again.
Guy: No, no, it's too late. That was The Killing Stroke, hon.
by Namrosseforp, RD. April 17, 2009

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