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1.
Fool, gullible person. See Tool.
Quit being such a monkey wrench, Vellius. Chris knew it was you the whole time, you shippler.
by MJK October 08, 2005
 
2.
To sabotoge or disrupt.
George W. Bush's claim of Iraqi weapons of mass destruction threw a MONKEY WRENCH in Colin Powell's political aspirations.
by Mikail Bevale March 06, 2005
 
3.
My favorite Foo Fighters song of all time. Great lyrics, great guita, vocals ,and drums all done by the renaissance man Dave Grohl.
What do you do when all your enemies are friends!
by alex k April 16, 2004
 
4.
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.
by cannocchiale September 20, 2010
 
5.
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.
by Mattony February 28, 2014
 
6.
When you bend a guys dick backwards between his legs and the woman sucks him off.
Monkey Wrench - When you bend a guys dick backwards between his legs and the woman sucks him off.
by Mac777daddy August 26, 2011
 
7.
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.
by Jared Saltalamacchia February 16, 2008