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".
"Wow that lunch came out quickly, I feel as dilated as a Butt Grogger"
by Achashveyrosh January 08, 2008