Finger of Funge

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?"

Person 2 " That's nasty, dude"