When a guy is getting a girl in the ass and he spits on her back so she thinks he is done then when she turns arounds he blows in her face

During anal sex or doggie style, right before climax the man spits a wad on the womans back. As she turns around thinking it is over, the man rubs it out in her face and exclaims "Abra-cadabra".

1. A famous magician and escape artist, Harry Houdini whose birth name was Ehrich Weiss. He was famous for his illusions and more importantly escapology. His most famous act was escaping the Chinese water torture cell, in which he was suspended upside-down in a glass and steel cabinet which was filled with water.

2. A sexual act where a man who is having sex doggy style pulls out a few moments before he comes, then spits on the woman's back, so she thinks he came. When she turns around he then unleases the real load all over her face. This has most likely never been successfully performed for numerous reasons: First, a woman isn't likely to turn around after you come on her back, she will just tell you to get a paper towel and clean it off. Second, the woman would probably hear you spit and say, "Why the fuck did you spit on me?" Third, most women would not have sex with someone again if they did this, so they wouldn't do it. It's still funny though.

The other definitions have missed the point of the Houdini. Regardless of the preamble, one most conclude the Houdini, not just by jizzing in the partner's eyes, but by then, yelling "Houdini" in a high pitched voice and runnign away, having "dissappeared" by the time their eyes are clear.

having sex with someone and leaving once they fall asleep with no warning or goodbye

(two guys needed) Be fucking your girl doggy style and make sure she is facing a window, Pull out and tell your guy friend to push in, make sure she does not know the other guy is there. Then run around to the outside of the window she is facing and scream "Ta-Da!"

To fuck a girl in the ass, near a window.
A friend of yours hides under the bed nearby.
You tell the girl you're going to pull out for a moment.
You're friend takes your place behind the girl.
You exit the building, and walk around so that you're visible from the window.
you wave to the girl from outside who (if timed correctly) will be reaching orgasm.