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1.
Military term; An evil mythical creature that whispers advice and ideas into the ears of military leadership, causing hundreds unnecessary changes and countless wasted man-hours every year. The Good Idea Fairy should be shot on sight if she is seen in your area.
Great! The CO has says that we need to provide a 24 hour guard over the weekend for the empty tents out on training area 17. He must've been visited by the good idea fairy.
by Trav September 27, 2004
 
2.
A mythical creature that causes upper level management to impose changes to standard operating procedures in an attempt to fix something that wasn't broken in the first place. These changes usually inflict undue stress and/or hardship on subordinates while having no negative effects on the decision maker.

Origin: US Military
The good idea fairy must be hanging out in Mr. Smith's office again. He just decided that we need to change the font on our 75 slide power point presentation to sans-serif 16.
by SOCM Doc January 11, 2014