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To give up or quit even if you're ahead because you've become too lazy to continue. Leblanking is usually accompanied by telling yourself that you'll actually finish next time, though you probably won't.
Andy: "I want you to make love to me like this is the last time we'll ever be together. Look me in the eyes, kiss me, and let me know that you and I are perfect, spinning in eternity in each other's arms."

5 minutes later...

Gabriella: "Ehh I'm tired. I'm gonna go watch The Notebook."

Andy: "WTF. You're really gonna leblank right now?"

Gabriella: "Oh my gosh yes, don't make fun of me, I'm on the dev team."
by Sean Cruue June 01, 2010
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