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.