When you are fingering a girl's Ass or Vagina and you switch to the other. Creating a layer of vaginal fluids and sweat around your finger.
Person 1 "Kathy wanted me to finger her ass and then , said "Now my pussy"."
Person 2 " So what'd you do?
Person 1 " Obviously I did it!"
Person 2 " Man she gave you a Finger Of Funge"
Person 1 "Is that what you call it?"
One who must compulsively handle or touch every item when entering a retail establishment, never with an intent to purchase the merchandise.
1. The proprieter of the local "Sunglass Hut" hated Barbara, as she was a known fingerfucker and would smudge all the lenses of the Prada eyewear and leave without spending a dime.
2. Retail managers hate fingerfuckers who take up sales clerk time, put their hands on everything, and then walk out.