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10.
An unlicensed or on-the-side mechanic that you go to when you can't afford to go to a real mechanic. Often used when the job is simple, or you no longer want to dump money into your very old car.
Can also be applied to a halfway knowledgable person in any field (ie: computer repairs, home repairs, gender reassignment)
"I took my car to this grease monkey I know and he screwed up my tranny. That'll teach me to stop being cheap."
by Bionic Latino August 28, 2008
 
2.
An automotive mechanic.

The word can be derisive or affectionate.
My brother in law is a grease monkey. He repairs Fords, so he always has plenty of work.
by The Wog Whomper May 11, 2005
 
3.
mechanic, or mechanically minded person
I got the grease monkey to fix my car
by bobbo June 06, 2003
 
5.
A teenager going through the tough times of puberty that begins to create a thick layer of grease upon ones face
Kevin: Mike, did you hear Nunzio is becoming a grease monkey?

Mike: My older brother just went through that, it's discusting!
by KKKillyourself December 16, 2013
 
6.
a mechanic who works with and repairs automobiles.
If you don't get to a grease monkey soon, you'll be up a creek without a paddle.
by The Return of Light Joker January 29, 2011
 
7.
Cool extension for firefox. Let's you run user scripts, that modify how a web page acts.
I use Greasemonkey in Youtube, I use a script that runs vids in HD automaticly.
by TheChosenBoy February 12, 2009