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

horizontal monster mash by Paublo Sanchez July 1, 2006

the horizontal monster mash 

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?)

the horizontal monster mash by teh_n00berx0r June 12, 2006