All things pertaining to extreme teenage-hood. Individual character descriptions of those in a group of friends. No two muffins are exactly the same. Usually preceeded by a adjective. Examples: The Genetic Muffin, Jekyll and Muffin, Crumbling Cranberry Muffin, The Anti Muffin, Half of a Siamese Muffin, The Ouji-Morning Glory Muffin. Origin: Little Red's vignette.