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
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The high pressure person who always thinks they have a better idea than everyone else. As a result, nobody wants to work with them.

Origin: US Military
Why didn’t we carry those boxes like the sergeant said? Then we wouldn’t all be in trouble!
Oh yeah, it was that good idea fairy who logiced her way through it and decided we didn’t need to.
Well that’s just great. Everybody thank the fucking good idea fairy for all that logic that nobody cared about in the first place.
by Das Erlebnis February 2, 2022
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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
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Military term: The absolute, iron-clad, no-bull date/time when any visit by the good idea fairy will not be tolerated by anyone for any reason. For most reasonable people this is not later than the time an operation plan or order is published. For senior officers and politicians this is only a hypothetical moment that never arrives.
"The good idea fairy cut-off date (GIF-COD) for this operation is the date we issue the order to the units," said the Commander. "I will personally kill anyone who suggests anything after that."

and;

"The attack was going well until the good idea fairy struck. They failed to establish a GIF-COD.
by Baghdad Bob April 21, 2006
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