English Noun black op (plural black ops) (informal) Clipping of black operation. 2020 February 26, Will Dunn, “William Gibson on the apocalypse: “it’s been happening for at least 100 years””, in New Statesman:He describes Russia’s reported attempts to influence the 2016 US election as “the most cost-efficient black op in human history […] ”Wikiwand - on Seamless Wikipedia browsing. On steroids.