motor finger 

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.

motor finger by G-the G rizzle May 15, 2008

Motor finger 

One who uses his or her fingers obsessively to text,surf the web or interact in social media.

Man this motor finger keeps blowing up my phone.

Motor finger by TheDDman1 January 4, 2015

Bad-Motorfinger 

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.

That there lass smells like she got herself the bad-motorfinger last night.

Bad-Motorfinger by Osheymoto March 21, 2021