An urgent instant message that takes so long to be responded to that it would be more time efficient to send a response through the post office. More often than not this occurs when the receiving party is actively participating in another activity.
Post Office IM Conversation:
Sender: Hey can you pick me up in the morning and take me to work?
... (30 minutes later) ...
Receiver: Sure!
Brought to public attention by Bob Woodward and Carl Bernstein in the book on the fall of Richard Nixon, All The President’s Men, ratfucker was Nixon’s term for a political operative who sows chaos among opponents; an agent provocateur. It is thought to have originated among campus political rivalries at USC, and seems to have some usage in the US military.
Along with Nixon’s other ratfuckers, Roger Stone caused fights at otherwise peaceful Democratic Party protests to generate a false narrative that the Democrats were violent and dangerous.