Etymology
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blowback (n.)

also blow-back, 1883, in reference to flames in enclosed spaces (firearms, furnaces, etc.), from blow (v.1) + back (adv.). Sense in reference to convert actions, etc., is from 1978.

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Definitions of blowback

blowback (n.)
the backward escape of gases and unburned gunpowder after a gun is fired;
Synonyms: backfire
blowback (n.)
misinformation resulting from the recirculation into the source country of disinformation previously planted abroad by that country's intelligence service;
From wordnet.princeton.edu