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adj. 1. Said of programs having a pretty, clever, or exceptionally well-designed interface.

"Have you seen the spiffy X version of empire yet?"

2. Said sarcastically of a program that is perceived to have little more than a flashy interface going for it. Which meaning should be drawn depends delicately on tone of voice and context. This word was common mainstream slang during the 1940s, in a sense close to #1.