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1.
When people with a common enemy end up harming each other instead.
"With the more conservative wing actively attacking the centrists, the Republican caucus quickly devolved into a circular firing squad."
by genius3456 September 13, 2009
 
2.
People involved in an idea or policy that is obviously self-defeating to everyone else but them. Used to described some group that is so clueless that one could show them a diesel engine and ask them to find the spark plugs.
The entire Bush administration and all others who decided to invade Iraq.
by federalq2b October 03, 2004