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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.
af The Wog Whomper 11. maj 2005
 
3.
mechanic, or mechanically minded person
I got the grease monkey to fix my car
af bobbo 6. juni 2003
 
5.
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.
af The Return of Light Joker 29. januar 2011
 
6.
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!
af KKKillyourself 16. december 2013
 
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.
af TheChosenBoy 12. februar 2009