The term 'Masseuse's Supply' can be summarized as a supply of OIL, which is a three-letter word. OIL is often used in massage therapy to reduce friction and provide a smooth surface for the masseuse to work with. It is also used to moisturize the skin and help relax the muscles. Massage therapists often use different types of oils, such as almond, coconut, jojoba, and olive OIL, depending on the type of massage they are performing.