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basically to have sex lying down, cannot be vertical
or doing the crazed dance of the time, also while lying down
also can mean 2 monsters having sex, lying down
i walked in a they were doing the horizontal monster mash
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This word was created in an episode of Futurama.
This word means two monsters, aliens, etc. having sex with each other while standing up.
"I Guarantee That By The End Of This Night You'll Be Doing The Vertical Monster Mash"
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Used by Phillip J. Fry from the TV show "Futurama" to describe sex.
Leela let's ditch these aliens so they can do the Sideways Monster Mash.
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sex with a chick... fucking a chick, banging a chick.. that sort of thing
omfg! Their doing the Horizontal Monster Mash on my leg!!! (WTF?)
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When a person has a bowel movement while showering and proceeds to force it down the drain with his/her foot.
I could tell from her glistening brown toes that Ethel had done the monster mash this morning.
The Michigan Monster Mash happens once a year on Halloween night. It is a event where many people at a Halloween party get together in costumes and have a mass orgy. The best part of the Michigan Monster Mash is that everyone is in a costumes and no one knows who is who. So next Halloween go to a local part and do the mash ;)
The Michigan Monster Mash happened in Ann Arbor Michigan on Halloween night in 1999, and has happened ever year since.