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1.
Letter sent to an individual or organization in professional "business-angry" style, expressing displeasure about actions taken, or lack thereof.
I sent a nastygram to my cell phone provider regarding why they've not adjusted my account, and they were pretty quick to fix it after that.
by Ben Schumin December 12, 2004
 
2.
An e-mail written in a tone that is confrontational. It is often petty and lacking in tact. A nasty gram can be venomous, incendiary, and/or hateful as well.
Jeff didn't have the balls to talk to me so instead he sent me a nasty gram.
by Wiseman July 13, 2006
 
3.
A angry note thats to the point, but try's to mask just how angry they are. Normally left by your boss.
" my boss said she wansn't mad about taking the day off, but she did leave me a nastygram on my desk"
by Maggielivesindenver January 24, 2008
 
4.
An angry letter, email, or note that expresses a person's distaste or disapproval for you.
After calling Cindy's house at 2am her parents sent my parents a nastygram.
by The Official Pussy Monster June 21, 2009
 
5.
a message, note, text, or some form of written communication that harbors a malicious intent towards the receiver; usually stems from feelings of anger, betrayal, disgust, contempt, aggressiveness, or frustration; usually has a threat involved
My best friend ditched me last night because he met some girl. I sent him a nasty-gram this morning.
by Infectious.Night March 18, 2011
 
6.
A note, often left anonymously, expressing displeasure of an action or perceived action of yours.
Someone who felt I parked too closely to him keyed my car and left a nastygram on the windshield.
by Eponym October 12, 2004
 
7.
A legal document stating that you should stop doing something, written in legalese and with the threat of taking you to court. A cease & desist letter.
When they released the FooCat :CueCat barcode scanner decrypting software, DigitalConvergence sent them a nastygram. My neighbor's lawyer sent me a nastygram telling me that my son is playing his Satanic non-music too loud and drawing pentagrams using plant food on his lawn, and will sue me for $666,666.00 if he doesn't quit.
by Braveheart's thirst for blood January 03, 2006