This is where you hide alot of your friends in a room where you know you will have sex, normally done at a party or gala event.
You take a girl (or rarely, a boy) whom you have no respect for into the room and commence having sex with her/him.
Right at the moment of climax, you give the prearranged signal and all of your friends emmerge laughing to scare and severly embarrass the victim
Dude, did you hear about Ellen?
No what happened?
At that party
last weekend Cole Closet Monstered her! Matt, Jordan, and Evan were all hiding in the room
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