A tiger team is a group of highly trained commando types that try to break the security of a secure installation, in order to stress test the security.

http://en.wikipedia.org/wiki/Tiger_team

Scott Adams made fun of management's prediliction to inappropriately use terms by doing some Dilbert strips in which the boss started rambling about "Tiger Teams" but in inappropriate context.

Today's STS-121 shuttle launch brought this subject to mind as they were referring to the "External Tank Tiger Team", which is a group of engineers who are charged with designing a safer system in which foam doesn't fall off the space shuttle at bad times during launch. Here's references to the ET tiger team:

http://www.nasawatch.com/archives/2005/10/executive_summa.html
http://www.aviationnow.com/avnow/news/channel_space_story.jsp?id=news/JUL06206.xml

Arg! Use the term correctly! A External Tank Tiger Team would be a team that is launching the shuttle in the middle of a freezing rainstorm, to see if a new foam design falls off under these conditions. It's not the right term for the guys actually trying to improve the design, it's for the people who try to break the design.