a variation on the basic canine-style sex act which proceeds as follows:
1. two male friends (or female friends with strapons) will select a lucky participant.
2. one friend will hide under a bed in complete silence as the other friend mounts the victem.
3. the friend under the bed will then switch places with the mounter. this is where some real skill is involved- the mounters MUST be smooth enough in their switch that the mountee notices nothing.
4. the gilted mounter sneaks outside and taps on the bedroom window.

the startled boner recepticle will then proceed to the window, where the origional sex partner will jump up and say,

"HOUUUUUUDINIIII!!!!!!!!!!!"

author's note: this is a move which requires both rehearsal and excellent comedic timing. this move has been used in conjunction with the clown surprise, steam roller, dirty sanchez, and hot lunch.

As a man reaches climax whilst in the "doggie style" position, the man pulls out and spits on their partner's back, fooling them into thinking that he has ejaculated, however, when their partner turns around, the man lets loose his baby yoghurt in his partner's face.

a houdini can also refer to a sex act where a male, who is fucking a chick doggy style in front of a first floor window, quickly pulls out, and his friend jumps in to continue banging her. the first man then proceeds to run naked and dance in front of his bitch outside the window. magic, eh?

nonetheless, the more accepted defineition is the genuine spit and skeet technique.

When having sex doggy style, when the guy is about to ejaculate, he pulls out and then proceeds to spit on the girls back so that she turns around, and blows it right in her eye.

Named for the infamous magician, the houdini is a sexual act in which a male engages his partner from behind and prior to ejaculating he pulls his penis out and spits on his partners back to simulate ejaculate. When his partner turns around he then ejaculates into his partner's face.

When a man has sex with a woman so that he is behind her and she is facing a window. The man has his friend hide in the in the room and during the middle of the act the man pulls out and his friend takes his place so that the woman does not notice. The man then runs outside and waves to the woman from outside of the window.

when you're fucking a girl from behind and she's facing a window. You withdraw quickly and have a buddy slip in, meanwhile you walk out side and wave to her through the window

The act of disappearing without warning whilst out clubbing or at a party with a group of friends. The disappearance being like that of Houdini's magic act; also known as "Pulling a Houdini".