nastygramn.
/ˈnɑːstᵻɡram/, /ˈnastᵻɡram/, U.S. /ˈnæstiˌɡræm/ colloquial (originally Military and chiefly U.S.).
Originally: a reprimand; esp. a written notice of a misdemeanour or error. In later use also more generally: a threatening, intimidating, or insulting message, esp. one sent by electronic mail.
ΚΠ
1966 F. Harvey Air War Vietnam in Flying Nov. 46/3 If he has to send a ‘nastygram’—a curt reprimand—to anybody, on deck or aloft, he doesn't hesitate.
1971 E. R. Murphy & C. Gentry Second in Command 75 Bucher had a habit of writing ‘nastygrams’, reminders of incidents that he wanted to recall when he made his next fitness reports.
1991 Times 19 Jan. 10/4 A software consultant..advises on the plague of gossip and ‘nastygrams’..afflicting company electronic mail.
2001 Richmond (Va.) Times-Dispatch (Nexis) 23 Apr. a12 The Court should send a blistering nastygram to Congress telling it the Mushroom Promotion..Act has no constitutional basis.
This is a new entry (OED Third Edition, June 2003; most recently modified version published online March 2022).
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n.1966