TIGER
  1. someone who has been repeatedly associated with goofed projects and operations and who actually has caused such to occur. He is a person who is continually out-ethics. He has failed to get ethics in on himself and he is in a group of people as a tiger would be dangerous. (FO 872)
[This is the derogatory form of this term and when it is used by LRH is not always meant in the above sense.]

Technical Dictionary