Slip Finger 

The digit you try to slip in your girl’s booty hole during vaginal intercourse. It either gets a welcome greeting or a mad dash for the exit.

I gave Rachel the old slip finger last night. Well that ended everything.

I took my changes with the slip finger on Cathy last night and she took two knuckles.

Slip Finger by Eaton Holgoode February 8, 2018

Flava Finger Slip 

When your finger accidentally, or "accidentally", slips through the toilet paper while wiping your ass. The booty-hole should be caressed or penetrated. Often accompanied by a soft, yet gratified, giggle-moan.

My coworker exited the bathroom with a Cheshire smile after a Flava Finger Slip.

Flava Finger Slip by ChawZed37 July 6, 2021

finger slip 

when a person places there hand on your butt, and starts running it slowly toward the bottom of your butt cheeks and then slips a flinger between so it touches your privet parts

So the guy touch my butt and gave me the (finger slip)
and it kind of felt good!!!!

finger slip by AmberTamberKamber December 16, 2011

Slip the finger 

When you are scratching your ass and a finger goes in.

When my friend scratches his ass, he likes to slip the finger.

Slip the finger by BlahGuide52003 January 13, 2021

Slimfinger 

A female in position of authority and/or knowledge, yet falls way short of such distinction.

Meat, I called that "Slimfinger" running the Moline tournament, and she knew nothing about the game times.

Slimfinger by KBvsFLW November 5, 2008