one familiar with the art of dry humping, also brandishing a ludacris ratty to the side of his left ear. a sern can usually be found loitering at the local mcdonalds asking for money for a 30 cent cone or "durrys" (ciggerettes). not the smartest or quickest mentaly at the best of times, a sern can usually be lured into a false sense of security with offerings of cheeseburgers,smokes, and pre pubesant pune.