Twilf Share definition Flag n. One who farts in the bathtub and bites the bubbles. v. His favorite pastime is twilfing. He may be incompetant, but at least he is a world class Twilfer. Twilf by Anthony A. Aardvark September 29, 2006 0 0 Get merch Get the Twilf mug. Buy Now ā $32.95 See more merch