Monsterbation is the act in which you touch yourself or masturbate to ugly people as popularised by the American Deathcore band The Irish Front in the 2008 release of Universe featuring the song monsterbation.
Touching yourself to ugly girls with ugly faces, oh honey that’s what we call monsterbation
by DeathcoreMadeMeDoIt July 12, 2021
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when one engages in the touching of oneself at a time when one's significant other is right beside them.

the monster replaces master because one who subjects themselves to such acts are obviously dirty pigs.
olive engages in monsterbation 24/7, even when he has just 69ed with the finest bitch, hence he is the ultimate perve who no one likes.
by Arntnok February 2, 2008
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When someone jerks off to pics of monsters, mostly erotic monster pics.
Fred: Hey, wanna go to a party later?
Jonh: No, man, im gonna stay home and I'll be "Monsterbating" all night
by realestguyintheroom November 1, 2011
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To play with your monster. Duh. It makes your palms hairy.
So there I was, bored one evening. Luckily, I had my monster in my closet, so I took it out and MONSTERBATED.
by demonicomelette March 22, 2003
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To touch ones self (I.e: masterbate) to ugly girls with ugly faces.
I didn't want to masterbate normally today, so I looked up some pictures of girls I work with that have really obtuse bodies and tweaked out faces, and I started to monsterbate rapidly.
by Pizzazzman April 12, 2011
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Two or more mattresses lying adjacent to each other. May be embedded (pun intended) into bed frames. Originated in 05C.
Also known as MonstreBed in some cases.
Patrick: Guys, MegaBeds are now declared illegal.
05C: ILLEGAL!
Patrick: However, MonsterBeds are okay.
by Oleh Zaychenko October 27, 2007
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Where you jerk off under someone's bed to scare them. Upon finishing, you shout "HAPPY HALLOWEEN" in your scariest voice.
"Hey, Jimmy, what did you get up to for Halloween. Costume party?"
"No, I just went on a monsterbation spree. Scared the little bastards senseless. It was both a trick and a treat."
"This friendship is over."
by Bruno Strongarm March 17, 2014
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