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1.
when a dude sticks his pointer finger in a chicks vagina and his ring finger and pinky in her butt.
usually happens when the chick wants to take it up a level from the "shocker" following the "opening act" comes the"show stopper"
by alwaysgone November 09, 2009
 
2.
The opening act is what you call the person who initiates intercouse for the sexual humiliating houdini. Precedes the closing act.
Person 1: Hey dude, you wanna houdini my girl with me?

Person 2: Yeah for sure, you got the opening act?

Person 1: This shit's gonna be hilarious.
by B.Hop February 16, 2009