Gravy finger
When one inserts a finger or thumb in to another's pooper and gets a decent amount of feces on their finger / thumb.
(Gravy fingering) The act of giving a gravy finger.
(Gravy fingerer) Your mom.
(Gravy fingering) The act of giving a gravy finger.
(Gravy fingerer) Your mom.
My dad gravy fingered me on the couch last night when I was trying to watch Malcom in the Middle.