When you're having sex with a girl and just as you're climaxing you pretend that you're penis is stuck. Then, you pull it out with your hand and yell "Excalibur!" as you beat off on the girl (or guy if that's what you're into).
"Dude, if you add "excalibur," it's gonna be like the fiftieth sex move on Urban Dictionary involving skeeting on a girl."
by DanneMedly June 21, 2008
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