Luser

Contraction of the words 'Loser' and 'User'. A Luser is a member of staff with an uncanny ability to make a mess of the computer system quite innocently and without malice.

The type of individual who can really mess things up so badly that the damage is either irrecoverable, or the only hope is to restore from backup, is a 'Power Luser'.

IT department fault logs should be used to identify any such individuals, and appropriate training or transfer to another function should be arranged at the earliest opportunity!