rant-o-gram 

An email typically sent by colleagues to one another that should really have had the benefit of 10 minutes calming down time before the send button has been clicked; the sort of email you would usually write to your internet provider complaining about their service, rather than your colleagues. This email is typically sent by someone who needs to vent and very often are sent before the sender reads the remaining thread in which their "concerns" are addressed.

"Just sent a rant-o-gram to those monkeys in HR. Not being paid for 3 months is really starting to affect my level of nutrition"
"We've all just been paid yesterday. Didn't you check your emails this morning?"
"That recall message function never works, does it?"

rant-o-gram by Steven Buck May 15, 2008