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1.
When you are having anal {or vaginal} sex with a girl bent over in front of you at the top of a staircase, and right before you cum you pull out, shove her down the stairs and launch your semen that splashes down all over her lifeless body and creates the chalk outline.
Man Stacey hasn't called me all week, she's still mad at me for the chalk outline I gave her on her parents back porch!!
by Dr. Donkey donk November 19, 2007