Top Definition
to pleasure yourself while drinking a Monster energy drink.
Igor seems hyper and distracted, he must be monsterbating.
by Tayvi February 04, 2010

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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

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When you jerk off so hard that its scary but it feels so good that you wanna squirt EVERYWHERE!

To being jerked off really hard and vigorously.
Honey! Why are you jerking off so hardddd!

Oh don't worry honey, I'm only monsterbating it doesn't hurt.
by Kajur April 02, 2013

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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 01, 2011

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The act of playing with one's monster unit in an app game in the restroom. At times, it is also done in public. It is a very vulgar act. Stroking, fingering, touching, and aiming are various ways in which one can play with their monster. At times, one can monsterbate furiously and come out not knowing how much time has passed.
Bob: Jim is taking an awful long time in the restroom.
Joe: He's probably just monsterbating in there.

To be caught in the act is to bring shame to oneself.
Jared: G..Gina! What are you doing here? I thought you left!

Gina: I forgot my keys. Wait, Jared? Oh my god! Are you monsterbating in public? Ew. That's just gross.
by YuppersDuppers October 31, 2015

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