usually performed in the Month of October when Halloween Mask are readily available. You and your partner engage in sexual intercourse while wearing these Monster Masks.
What are you doing tonight?

Frank and I are going to be "Monster Fucking" after we Trick or Treat.
by Frank da tank August 23, 2006
Get the Monster Fucking mug.
n. A girl who is always at the cock.
v. A person fucks like a fiend.
adj. Some who is too ugly to fuck
n. Damn Mo is such a fuck monster, she always grabing at my shit.

v. I tried to stay with it all night, but she was a fuck monster and I dried out.

adj. Look at Felix, he knows she aint looking at him, he's a fuck monster.
by P. Will November 5, 2006
Get the fuck monster mug.
When A Really Fat/Obese Man Fucks A Girl In The Ass So Hard That They Shit, Thus Making The Man Really Horny And Smears It All Over Himself Then Eating It
Man I Totally Just Got Done Poop Monster Shit Fucking This Really Hot Babe
by CaptnDesDes December 13, 2010
Get the Poop Monster Shit Fuck mug.
When you can't decide between complete dick and complete monster.. Can refer to a partner who swindles you out of 30k and then breaks up with you to hookup with someone asap
Me: "I just got bamboozled. I thought it was the real deal, but I just lost everything.. :("

Friend: "damn. You just waisted a year and a half on a complete fucking monster dick."

P.S. both of those are actually just me, I'm just really sad..
Get the A complete fucking monster dick mug.