Originates from Billboard Magazine's practice of putting a bullet sign in front of chart entries that have moved from one position to another with notable speed.
2) a radio station DJ, or MC at a club or event.
2) the club boom anniversary party spin doctor was awesome!
Connotes a lack of interest in the current interlocutor and/or in what they are currently saying, and displays a desire to, if possible, upgrade to 'someone better' (e.g. of higher social status, better looks, etc.).