fum

from The Collaborative International Dictionary of English v.0.48

Fum \Fum\, v. i.
   To play upon a fiddle. [Obs.]
   [1913 Webster]

         Follow me, and fum as you go.            --B. Jonson.
   [1913 Webster]

from Jargon File (4.4.4, 14 Aug 2003)

fum
 n.

   [XEROX PARC] At PARC, often the third of the standard {metasyntactic
   variable}s (after {foo} and {bar}). Competes with {baz}, which is more
   common outside PARC.

from The Free On-line Dictionary of Computing (8 July 2008)

fum

   <jargon> At {Xerox PARC}, often the third standard
   {metasyntactic variable} after {foo} and {bar}.  {baz} is more
   common outside PARC.

   [{Jargon File}]

   (2003-09-24)

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