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