In the context of “Jersey Shore,” the term “IFF” stands for “I Fight Fish.” It is often used by cast members, particularly by Mike “The Situation” Sorrentino, as a playful way to convey their tough or combative persona while also being humorous. The phrase encapsulates the show’s blend of humor, bravado, and the lively atmosphere of the party lifestyle that the cast is known for. The show often features exaggerated personalities and catchphrases that contribute to its cultural impact and popularity.