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[WPI: from the DEC acronym 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.