What is Motor Finger?
1.
1) After working on any mechanical project, in which your hands become covered in grease, with no possibility of cleaning the residue from under the finger nails or prints; to stimulate the old ladies vagina causing a slight irritation only brought up the next day after you have fallen asleep in satisfaction of completing a hard days work.
Dude, last night after i finished the tranny on the dodge I totally motor finger the old lady before bed.
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1. 
A derogatory term referring to an exceptionally hormonal or moody female  sometimes used in a satirical manner or with malice
You are b..