monster mash 

when you are trying to have sex with a girl but you don;t have a full erection, so you grab and squeeze the base of your dick and try to 'mash' it into the girl in hopes of stuffing it in and getting an erection

beau was having trouble dr'ing this girl because he was too drunk, so he used the monster mash method.

monster mash by Duke Lacrosse December 26, 2008

Monster Mash 

When you bang a chick that has had multiple abortions. You know. Cause it's a graveyard smash.

Yo, dat loose chick from work had another abortion and got dumped by her man. Imma try to Monster Mash.

Monster Mash by Def my real name May 23, 2021

monster mash 

When you shit in someones ear and then fuck the shit.

Dude, I went to a gay bar and I think I was monster mashed.

monster mash by Fernando November 16, 2004

Monster Mash 

Masturbating. Flicking off. Jerkin' off. Fucking yourself. Whatever you call it

After seeing that hot girl I did the Monster Mash

Monster Mash by Alex Smith May 13, 2005

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

Vertical Monster Mash 

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"

Vertical Monster Mash by Soldier 91 January 24, 2005

Sideways Monster Mash 

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.

Sideways Monster Mash by Zoidberg101 March 16, 2011