nastygram, n.
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.

Note to be Slipped under the Door of the Out-of-Humour Superior 

The heated wrist is not slowed
By a second thought.
It relays in Remorse Code:
Rash-rot-rash-rot-rot.