A bowl of cereal with the combination of "Boo Berry", "Count Chocula", and "Franken-berry" in it.
I bought the variety pack for the Halloween themed cereals. I'm going to have myself a monster mash!
by BuGgY_BiTz October 12, 2019
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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.
by Duke Lacrosse April 26, 2007
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When a large and/or ugly person walks lazily or has some sort of cane in a certain direction.
Hey, do you see that guy monster mashing his way over here?
by Pbrizzle198Nizzle September 13, 2011
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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.
by Fernando November 16, 2004
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Masturbating. Flicking off. Jerkin' off. Fucking yourself. Whatever you call it
by Alex Smith March 25, 2005
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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
by Paublo Sanchez June 30, 2006
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