n : A distribution CD (and, rarely, a DVD). These are given away for free at concerts, and they can either be promotion for a new album or single, or they can be a live-only song recorded especially for distrubution at that concert
n : lit. "box" - A slang term for a livehouse
v : Following a band for some of their concert tour
n : A lower ticket number, which means being able to enter the livehouse earlier than higher-numbered tickets
v : Headbanging
n : One's favorite band
n : The story usually told just before an encore. Just a special name for this particular MC