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"prank, caper," 1807, American English slang, perhaps from the name of the Carthaginian queen in the "Aeneid." Usually in phrase to cut didoes.
: The DIDO principle still applies to its contents sentence A product can be no better than its constituents; esp, the validity of a computer's output cannot surpass the validity of the input; gigo
[1980s+ Computer; fr the abbreviation of dreck in, dreck out, ''shit in, shit out'']