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 a collection of monsters have a party and spend the evening dancing with no regard for others
oh my god Nigel, the monsters next door are having a monster mash again they will keep us up all night again.
Can you go around and have a word with the chief monster 'Paul' and ask him not to make them strange ape noises again
by Neil O'Malley July 12, 2006
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it was a graveyard smash
it caught in a flash

a party of monsters guest included wolfman dracula and his son

The coffin-bangers arrived With their vocal group, "The Crypt-Kicker Five"

The monster mash is the hit of the land
For you, the living, this mash was meant too
When you get to my door, tell them Boris sent you
The zombies were having fun the party had just begun they did the mash they did the monster mash
by Kenny Luge October 9, 2006
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Mixing Count Chocula, Franken Berry, Boo Berry, Yummy Mummy, & Fruit Brute in a large bowl like a cereal suicide.
by avessely February 17, 2008
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Unprotected sex on Halloween necessitating an abortion, or a "graveyard smash"
Bro #1: Did you see that girl in the slutty giraffe costume?

Bro #2: Yeah, we monster mashed!

Bro #1: Nice! Better graveyard smash soon.

Bro #2: Yeah. We have an appointment after the new year.

Bro #1: Dude, that's too long. Haven't you heard about the heartbeat bill? You'd better get in there soon and get that baby!
by Justin1234321 August 23, 2019
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when you poo in the shower and then mash it down the drain with your toes
Every day after P.E. Jill did the monster mash and then wore sandals to math.
by Brown Eyes January 20, 2005
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