monkeywrench 

any person who uses someone else's pre-existing attraction to them to mess up any relationship that other person might become involved in, regardless of whether or not they return feelings of attraction.

Liz could have cared less about Dre's attraction to her when he was single, but now that he's with Carrie, she's acting like a big ol' monkeywrench.

monkeywrench by cannocchiale September 20, 2010

monkeywrench 

The process by which a female bends a male's penis backwards between his legs and proceeds to suck him off.

In 2001, Mike Krzyzewski, head coach of the Duke University men's basketball team, reportedly gave each potential recruit a monkeywrench upon their official visit to campus. Being eventual Duke basketball players, they all enjoyed this very much.

monkeywrench by Jared Saltalamacchia February 16, 2008

Greasy Monkeywrench 

Using lotion during a handjob (see hj)
The penis represents a monkeywrench
Lotion represents grease
Thus a GREASY MONKEYWRENCH

Tommy:Dude last nite Lisa totaly gave me a Greasy Monkeywrench
Luis:Dude, I got one two nites ago
Tommy:Sweet dude
Luis:I know man

Greasy Monkeywrench by fuckbitchesgetmoneyforlife July 2, 2011

Monkeywrenching 

A type of most oftenly illegal sabotage for the means of slowing down, or making it counter effective to continue with a certain activity. Or simply to spread chaos.

Often used by activist for ecodefense against government sanctioned activity (clear cutting, polluting, etc.) by means of spiking trees, sugar in gas tanks of equipment, etc. Can also used against the statis quo and corporate america by wheat pasting bill boards, filling pay phones with vanille pudding, etc.

The best monkey wrenchers are never caught because they usally work alone and never tell anyone of their doings for that is how one is caught.

I often like to monkeywrench on the weekends since I'm forced to take the corporate cockshaft 5 days a week.

Monkeywrenching by Rankojin July 15, 2004

Monkey Wrench 

1. An adjustable wrench.
2. An imaginary tool of sabotage, destruction, overthrow and mischief.

1. Hey would you be so kind and hand me that monkey wrench?
2. Everything was going so well but then you threw a monkey wrench in my plan.

Monkey Wrench by Mattony March 9, 2014

Left-handed monkey wrench 

A fictitious tool. A monkey wrench has no left-handed or right-handed versions. Often used as a practical joke, i.e. telling someone to find a left-handed monkey wrench for you.

"Hey, will you go find me a left-handed monkey wrench? I need to fix this pipe."

Left-handed monkey wrench by Fictitious Plumber January 30, 2012

monkeywrenched 

The act of having an imagined wrench thrown into a system to mess it up or change things drastically.

A term used to describe a BIG upset in a regular season football match-up; typically refers to the conference or championship the teams are playing for or to get to.

Bob went and monkeywrenched the whole plan by asking his annoying buddies to come with us.

Iowa St. beat OSU?? The BCS has just been monkeywrenched!

monkeywrenched by Allynius November 19, 2011