The act of masturbating under one's bed or in one's closet with the intent to frighten.
Greg was scared shitless when he found Aaron monsterbating in his closet at 3 am.
by TheProfessor42069 May 27, 2011
Get the Monsterbating mug.
n.

1. one who monsterbates
2. a monster masturbating
3. a huge artificial penis
4. masturbation of a large penis
5. a huge masturbating monster
If Bigfoot exists, then he's a monsterbator.
by camp lickalotta March 14, 2008
Get the monsterbator mug.
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
Get the monsterbation mug.
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
Get the Monsterbating mug.
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
Get the monsterbate mug.
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
Get the Monsterbate mug.
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
Get the MonsterBed mug.