smoke-emitting diode

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

smoke-emitting diode
SED

   <humour, electronics> (From "{light-emitting diode}") An
   incorrectly connected {diode}, probably a {light-emitting
   diode}, in the process of losing its {magic smoke} and
   becoming a {friode}.

   See also {LER}.

   (1996-04-28)