/spi' fee/ 1. Said of programs having a pretty, clever, or exceptionally well-designed interface. "Have you seen the spiffy X version of empire yet?"This was common mainstream slang during the 1940s.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.[Jargon File]