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1 definition found
 for JFCL
From The Free On-line Dictionary of Computing (30 December 2018) :

     /jif'kl/, /jaf'kl/, /j*-fi'kl/ (obsolete) To cancel or annul
     something.  "Why don't you jfcl that out?"  The fastest
     do-nothing instruction on older models of the PDP-10
     happened to be JFCL, which stands for "Jump if Flag set and
     then CLear the flag"; this does something useful, but is a
     very fast no-operation if no flag is specified.  Geoff
     Goodfellow, one of the jargon-1 co-authors, had JFCL on the
     licence plate of his BMW for years.  Usage: rare except among
     old-time PDP-10 hackers.
     [{Jargon File]

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