A category of fan-fiction or other written media containing heavily suggestive or explicitly sexual content, often intended solely for sexual gratification, possibly without any other story elements.
An extremely dirty or vial slut that will never be a swan. The "smut duck" usually takes advantage of the drunkest guy(s) at a party. A.K.A. mud duck(hideous female)..... however dirtier(ie. taking it in the ass).