JFCL (djif'kl or dja-fik'l) [based on the PDP-10 instruction that acts as a fast no-op] v. To cancel or annul something. "Why don't you jfcl that out?" [The licence plate on Geoff Goodfellow's BMW is JFCL.] JIFFY n. 1. Interval of CPU time, commonly 1/60 second or 1 millisecond. 2. Indeterminate time from a few seconds to forever. "I'll do it in a jiffy" means certainly not now and possibly never. JOCK n. Programmer who is characterized by large and somewhat brute force programs. The term is particularly well-suited for systems programmers. J. RANDOM See RANDOM. JRST (jerst) [based on the PDP-10 jump instruction] v. To suddenly change subjects. Usage: rather rare. "Jack be nimble, Jack be quick; Jack jrst over the candle stick." JSYS (jay'sis), pl. JSI (jay'sigh) [Jump to SYStem] See UUO