The act of inserting a "Purim" (the Jewish
counterpart for
Halloween) "Grogger" (noise maker) in one's anus while leaving the handle protruded. Another will grab the protruded handle and await the cantor's reading. As the cantor says "Haman" (the evil man) the handle-holder and the Butt Grogger will turn
oppositely; thus emanating the muffled-clicking sound constituting the "Butt Grogging".