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Generally relates to an obsurdly confusing situation one may find themselves in; often shocking, offensive, and in poor taste. Having little or nothing to do with decency. Pertains strongly to the inquiry of, "What the fuck were you thinking?!"
After walking in on your girlfriend hooking up with someone else:

"What the fuck is going on here?! This is lunacy!"
by googoo October 25, 2004
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The 2009 Challenge for the FIRST Robotics Competition. A game that isn't only named for the surface that is supposed to represent the friction or lack there of on the moon but also because of the craziness that is going to ensue because of the hectic throwing of moon rocks and robotics with the anti-traction wheels and trailers.
This year's challenge is Lunacy... it's really gonna be Lunacy come competition time.
by BuilderGirl2009 January 04, 2009
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SA State of Mind achieved when someone has stepped over the edge of Extream Sanity (Geninus) or fallen over the edge of extream insanity (Lunactic).
Paul Cardinal is said to be an embodiment of Lunacy, he has fallen over the edge of insanity and been visited by men in white coats; he also has been given an award for his achivements in academics, its hard to justify his true state of mind, so the Courts just said Lunacy.
by The Man without a Purpose March 17, 2009
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A slightly more musical way of saying "insanity". It was once an accepted medical term, but like "retarded" and "dwarf" it has fallen by the wayside. The word derives from the belief that mental illness is somehow related to the phases of the moon, a conviction widely held until it was debunked by the advent of modern medicine.
"I shall have to invent a new form of lunacy for you." Dr. Seward to Renfield, Bram Stoker's Dracula
by Allison1690 September 16, 2006
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The art of intentionally understating one's strength, (see sandbagging) with the intention of deceiving one's opponents, he then can reveal a hidden strength to take the opponent by surprise. And when confronted with factual information, deny everything throw as many people under the bus that you can fit.
Did you see Luna-cy got caught with another stacked team? Yeah he got caught though and cried the entire way home.
by Nunya Bizness April 25, 2007
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