The term "down to fuck" (DTF) is slang for a person willing to have sexual intercourse (or fuck) with another person, often in the form of casual sex. The term has been in use since 2007 having been mentioned in the film Superbad and has been widely used in the media, movies, and music. It was a catchphrase used by Mike "The Situation" Sorrentino on the Jersey Shore. References ...