Source : WordNet®

time bomb
     n 1: a problematic situation that will eventually become
          dangerous if not addressed; "India is a demographic time
          bomb"; "the refugee camp is a ticking bomb waiting to go
          off" [syn: {ticking bomb}]
     2: a bomb that has a detonating mechanism that can be set to go
        off at a particular time [syn: {infernal machine}]

Source : Free On-Line Dictionary of Computing

time bomb
     
         A subspecies of {logic bomb} that is
        triggered by reaching some preset time, either once or
        periodically.  There are numerous legends about time bombs set
        up by programmers in their employers' machines, to go off if
        the programmer is fired or laid off and is not present to
        perform the appropriate suppressing action periodically.
     
        Interestingly, the only such incident for which we have been
        pointed to documentary evidence took place in the Soviet Union
        in 1986!  A disgruntled programmer at the Volga Automobile
        Plant (where the Fiat clones called Ladas were manufactured)
        planted a time bomb which, a week after he'd left on vacation,
        stopped the entire main assembly line for a day.  The case
        attracted lots of attention in the Soviet Union because it was
        the first cracking case to make it to court there.  The
        perpetrator got 3 years in jail.
     
        [{Jargon File}]
     
        (2001-09-15)