Top Definition
Common way of referring to a Douglas DC-9 aircraft or any of its derivatives such as the MD-80, MD-88, MD-90, Boeing 717, etc.
Dude, you flew here on a Greasy-9? Lol, I didn't know the FAA allowed that stuff to fly anymore.
by pitz August 26, 2004
1 Word related to Greasy-9

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