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nastygram /nas'tee-gram/ n.

1. A protocol packet or item of email (the latter is also called a [letterbomb]) that takes advantage of misfeatures or security holes on the target system to do untoward things. 2. Disapproving mail, esp. from a [net.god], pursuant to a violation of [netiquette] or a complaint about failure to correct some mail- or news-transmission problem. Compare [shitogram], [mailbomb]. 3. A status report from an unhappy, and probably picky, customer. "What'd Corporate say in today's nastygram?" 4. [deprecated] An error reply by mail from a [daemon]; in particular, a [bounce message].