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.
by G-the G rizzle May 15, 2008
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A bad-motorfinger is a sex move performed when a mechanic is finished with a hard day's work and his hands are absolutely soiled with motor oil. This filth is in every crease and crevess of the mechanic's hands, including underneath their cracked and withered fingernails. This hand is used to fingerblast a victim in one hole of the mechanic's choosing until all of the grime is successfully deposited within the receiver, leaving the mechanic's hand ready for more heavy duty work.
by Osheymoto March 21, 2021
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