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1.
The art of masturbating whilst furiously running round hitting and kicking in a frenzied state in an attempt to destroy as much of the room you're in as possible
"Wow I just had a monster wank in my bedroom and chucked my computer through the window."

"Doctor, i've broken all my knuckles and cut my forehead."
"What were you doing?"
"Having a monster wank"
by Eddy The Hero July 21, 2008
 
2.
When men form a circle around one chicken and all masterbate until they all blow their load on her.

And she will be standing there dripping in semen. Classy
"Molly you're in my £70 dress"
"Good, I'll get the lads at the party to monster wank on it"
by Eleanor Hubbard August 03, 2014