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.

When you eat dirt for the first time and leave your family to build a shack in the woods

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