futz

from The Collaborative International Dictionary of English v.0.48

futz \futz\ v. i.
   To fool around; to act without plan or purpose; -- usually
   used with around; as, don't futz around with a device without
   understanding its operation. [Slang.]
   [PJC]

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

futz

   <jargon> To waste time on non-productive activity.  Not
   normally used for game playing.

   (1995-03-27)