The Jargon File (version 4.4.7, 29 Dec 2003):

sagan
 /say'gn/, n.

    [from Carl Sagan's TV series Cosmos; think ?billions and billions?] A large
    quantity of anything. ?There's a sagan different ways to tweak EMACS.? ?The
    U.S. Government spends sagans on bombs and welfare ? hard to say which is
    more destructive.?


The Free On-line Dictionary of Computing (30 December 2018):

sagan

    /say'gn/ (From Carl Sagan's TV series "Cosmos")
   Billions and billions.  A large quantity of anything.

   "There's a sagan different ways to tweak Emacs."  "The US
   Government spends sagans on bombs and welfare - hard to say
   which is more destructive."

   [Jargon File]

   (1999-10-12)