v. to falsify official documents, reports, logs, etc. especially in cases where work was not actually performed.
The area on old British warships below the upperdeck, to give a false perception of the actual amount of ammuniton onboard. This is supposedly how the term was derived.
"Rogge was too lazy to do the 7 day and gundecked the MAF like usual"
"Some people gundeck their whole resume to land top-notch IT jobs"