Racing term: A bearer of bad news. Usually directed at someone who is having a pretty nice day. Occasionally the message will be cryptic and/or coded, and will need to be repeated, forcing the listener to slow down and re-evaluate his/her life.
eg.1) Driver 2, driver 1 is faster than you. Driver 1 is faster than you. Can you confirm that you understand this message? eg.2) Not to sound like a Smedley here baby, but you could be a little quicker in Sector 2. Oh, and you have a spring stuck in your head...sorry.