conspiracy theory

noun
1.
a theory that explains an event as being the result of a plot by a covert group or organization; a belief that a particular unexplained event was caused by such a group.
2.
the idea that many important political events or economic and social trends are the products of secret plots that are largely unknown to the general public.

conspiracy theorist, noun
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Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
conspiracy theory
 
n
the belief that the government or a covert organization is responsible for an event that is unusual or unexplained, esp when any such involvement is denied

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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00:10
Conspiracy theory is always a great word to know.
So is interrobang. Does it mean:
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
a stew of meat, vegetables, potatoes, etc.
Example sentences
The rest of your commentary amounts to add a new conspiracy theory on top of
  the old one to protect it.
The first is an observation based on general business motive, the other is an
  unsupported conspiracy theory.
There's a grain of truth to any conspiracy theory and it turns out there are a
  lot of grains of truth to this one.
Here is a little bit of a conspiracy theory on algae as a bio-fuel.
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