The person being 'wrenched,' as the kids like to call it, takes a big water jug (like the ones for water coolers) and shoves the mouth of the jug into his/her ass. Once the jug is inserted the person does a hand stand, letting the water flow freely into his ass. Often done as a practical joke. A hand stand is not nessisary in joke form, you may just tip it over and let the person enjoy!
-We 'monkey wrenched' Allan last night, he got really pissed off!
-Look at Osama, he's so drunk he's doing a 'monkey wrench' right on the table!
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.
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.