What is the horizontal monster mash?

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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the horizontal monster mash - video

The horizontal monster mash - what is it?

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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