Top Definition
a problem area that unexpectedly arises and has the potential to reveal one's incompetence in a meeting. Grey Herrings occur predominantly in the calvinus stupidicus species. Grey herrings are stress-inducing and evoke compulsive lying.
calvin was nervous going into the meeting because of the grey-herring rumored to be swimmin around the switchyard.
by Senor P August 20, 2010

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