Better known as a "PoesZonk". A zonk is when you put your hands together and shove them into the anus of a person that is looking the other way as a joke. A Ponk is when you do it with a girl on the vagina from behind when she is not looking. Everyone always laughs and laughs. Gloves are recommended when she is wearing a skirt.
Look how Cindy is leaning forward at Gretel's desk, I am quickly going to "ponk" her before she turns around.
Ponk is a munecraft youtuber most famous with his work on the dream smp he is missing one arm canonically and in reall life is a very little man but we all accept him even on tommy's land.