When a girl inserts her finger or fingers into a mans anus and begins to stimulate the area in a variety of fashions e.g. twisting the finger, attempting to click the fingers, or scratching using the nail.

When Eli shoves his fingers up mychals ass and mychal likes it

little boney fingers of wives that try to insert into private places

April 2nd is National Finger Ass Day

A man who was sober and ate cooked yogurt out of a microwave, and got a finger shoved up his ass. CYAF’s are very rare to find. There’s at least one Cooked Yogurt Ass Finger in this world.