The act of
bad-mouthing someone
via instant message, only to find out that you just instant messaged that
person, instead of the intended audience.
Instant message Conversation:
Bob: Hey Melissa, would you rather kiss Nashe or eat a sand sandwich
Nashe: What are you talking about? What is your question?
Bob: Oh crap, nevermind
Nashe: Oh
shit, I've just been Nashe'd