cuspy /kuhs'pee/ [WPI from the DEC abbreviation CUSP, for `Commonly Used System Program', i.e., a utility program used by many people] adj. 1. (of a program) Well-written. 2. Functionally excellent. A program that performs well and interfaces well to users is cuspy. See rude. 3. [NYU] Said of an attractive woman, especially one regarded as available. Implies a certain curvaceousness.