Top Definition
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
1 more definition
Chocolate ice cream, chocolate fudge, chocolate ice cream, chocolate fudge
Mike's favorite ice cream is Motor Oil
by elipolo May 13, 2010

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