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
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
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