Down and Dirty Duck

Down and Dirty Duck, promoted under the abbreviated title Dirty Duck, is a 1974 American adult animated comedy film directed by Charles Swenson and starring Mark Volman and Howard Kaylan Flo amp Eddie as the voices of a straitlaced blue collar worker named Willard and an unnamed duck, among other characters. The plot consists of a series of often abstract sequences, including plot material created by stars Kaylan, Volman, Robert Ridgely, and, according to the films ending credits, various people Swenson encountered during the making of the film. Dirty Duck received mostly negative reviews, with many criticizing it for its crude humor and others seeing the film as an attempt to cash in on the success of Ralph Bakshis Fritz the Cat. Dirty Duck fared better on home video and is now considered a cult film.

When Willard tells her that the insurance company wont pay until her death, she dies of a heart attack. Her will stipulates that her killer must take care of her duck. After the duo spend a night in jail, the duck takes Willard to a brothel. After a wild night of partying, they wind up in the desert, where the duck dresses Willard in womens clothing in an attempt to get a ride. After several encounters with an old prospector dying of thirst, a racist police officer, two lesbians, and a short Mexican man, they are finally picked up by a trucker.Back at his apartment, Willard creates a makeshift sex object, which the duck eats. Shortly after, Willard discovers that the duck is a girl, and has sex with her. The following morning, Willard and the duck go to Willards job, where Willard has sex with his female boss, and quits his job shortly after. Willard and the duck leave, and the movie ends with Willard saying that the duck was a good duck after all. ........

Source: Wikipedia