noun. An insult that hits the insultee right where it hurts: in the face and the butt. Especially the butt.
Real citation: "I'm going to see thee Kaelyn next weekend. I'm going to be Kirka-ayayyayya......
(June 14, 2003, The Life and Times Of the Almighty Chez, http://sickndisgruntld.livejournal.com/)
Made-up citation: "Only a trained buttockologist can distinguish a perennial buttfacebutt from a congenital assfaceass, according to the brochure for Bippy University, which a shapely proctologistette slipped into my Raisin Bran."