blowback

World English Dictionary
blowback (ˈbləʊˌbæk)
 
n
1.  the escape to the rear of gases formed during the firing of a weapon or in a boiler, internal-combustion engine, etc
2.  the action of a light automatic weapon in which the expanding gases of the propellant force back the bolt, thus reloading the weapon

Collins English Dictionary - Complete & Unabridged 10th Edition
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WordNet
blowback

noun
1. the backward escape of gases and unburned gunpowder after a gun is fired 
2. misinformation resulting from the recirculation into the source country of disinformation previously planted abroad by that country's intelligence service 
WordNet® 3.0, © 2006 by Princeton University.
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