Top definition
An explosive or otherwise incendiary nastygram precisely directed at a small group of its wide blast radius of 100+ bcc's. Capable of leveling an entire office building's morale.
After weeks of Tom and Peter leaving the whiteboard unerased, Kristine dropped a NastyJDAM on the entire department's listserv to express her displeasure.
by Pierogi11 August 10, 2019
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