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an exceptionally dark beer or ale, usually drunk by men who need an extra kick at Happy Hour
Jonny said to Eric, "What are you drinking there - motor oil?"
by MaryPoppins December 29, 2007
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2
by elipolo May 13, 2010
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3
An exceptionally thick and bitter coffee enjoyed by military personnel all over the world. Usually brewed from the cheapest coffee in the dirtiest pot available.
Bill: "Hey Joe, you have the watch tonight get some sleep.".

Joe: "Nah, I'm good, got some of Cheifs Motor Oil to keep me runnin."
by TChaser November 09, 2016
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