Used to describe the state of having one of your Tweets replied to by a user with 6 or 7 Tweets of his or her own.
Named in honor of Twitterer Justin Mundie, whose proclivity toward verbose replies spread over several Tweets led to the coining of the term.
Also forms the basis for the "reverse Mundie"
Me: "Woah, Phil, have you seen your list of @ replies?!? That Justin guy really went to town replying to your statement about taxes!"
Phil: "Yeah, I totally got Mundied on that one."