The term 'Fake Fat Brand' refers to the brand name OLEAN, which is a 5-letter word. OLEAN is a brand of fat substitute created by Procter & Gamble in the late 1980s. It was designed to replace fat in food products, providing the same texture and flavor without the calories. OLEAN was used in a variety of products, including potato chips, cookies, and ice cream. It was eventually discontinued in the early 2000s due to health concerns.